Methods for inducing differentiation of undifferentiated mammalian cells into osteoblasts

ABSTRACT

The present invention relates to in vivo and in vitro methods, agents and compound screening assays for inducing differentiation of undifferentiated mammalian cells into osteoblasts, including bone formation enhancing pharmaceutical compositions, and the use thereof in treating and/or preventing a disease involving a systemic or local decrease in mean bone density in a subject.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. Ser. No. 11/478,193, filed Jun. 29, 2006, which is a continuation-in-part of PCT/EP2004/014885, filed Dec. 29, 2004, which claims priority to PCT/EP03/14994, filed Dec. 29, 2003, both of which applications designate the USA, the disclosures of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to agents, and methods for identifying compounds, which agents and compounds induce the differentiation of undifferentiated cells and/or osteoblast progenitor cells into osteoblasts. In addition, the invention relates to compositions and methods for the use thereof in limiting undesired bone loss in a vertebrate at risk of such bone loss, in treating conditions that are characterized by undesired bone loss or by the need for bone growth, in treating fractures, and in treating cartilage disorders.

Bone remodeling relies on an equilibrium between an anabolic (osteogenic) and a catabolic (bone resorption) process. Bone is a dynamic tissue that is continuously being destroyed (resorbed) and rebuilt, by an intricate interplay between two distinct cell lineages: bone-forming cells, known as osteoblasts and bone-resorbing cells, known as osteoclasts.

A number of diseases are the direct result of a disturbance in the fine-tuned balance between bone resorption and bone formation. These diseases for the most part are skeletal diseases and inflict a large number of patients. Exemplary diseases include hypocalcaemia of malignancy, Paget's disease, inflammatory bone diseases such as rheumatoid arthritis and periodontal disease, focal osteogenesis occurring during skeletal metastases, Crouzon's syndrome, rickets, opsismodysplasia, pycnodysostosis/Toulouse-Lautrec disease, and osteogenesis imperfecta. Of great significance are the chronic conditions of rheumatoid- and osteo-arthritis and osteoporosis, including age-related osteoporosis and osteoporosis associated with post-menopausal hormone status. Other conditions characterized by the need for bone growth include primary and secondary hyperparathyroidism, disuse osteoporosis, diabetes-related osteoporosis, and glucocorticoid-related osteoporosis. The single most prevalent bone disease is osteoporosis, which affects 1 in 5 women over 50 and 1 in 20 men over 50.

Other conditions that are characterized by the need to enhance bone formation include bone fractures, where it would be desirable to stimulate bone growth and to hasten and complete bone repair. Bone fractures are still treated exclusively using casts, braces, anchoring devices and other strictly mechanical means. Other bone deficit conditions include bone segmental defects, periodontal disease, metastatic bone disease, osteolytic bone disease and conditions where connective tissue repair would be beneficial, such as healing or regeneration of cartilage defects or injury. To treat all of these conditions, bone remodeling processes are required; however, in many instances, patients are encountered with poorly healing fractures or bone defects. Consequently, surgical intervention is often required to accelerate the recovery. Such surgery may implant a prosthesis with or without bone grafting procedures. In many cases where the bone is too porous or where previous implants failed to be incorporated into the bone, current medical practices can offer little or no help. There are currently no satisfactory pharmaceutical approaches to managing any of these conditions. While further bone deterioration associated with post-menopausal osteoporosis has been decreased or prevented with estrogens or bisphosphonates, current therapies do not build new bone to replace bone that has already deteriorated.

The activities of bone cells are regulated by a large number of cytokines and growth factors, many of which have now been identified and cloned. Mundy has described the current knowledge related to these factors (Mundy 1996: Mundy 1993). Although there is a great deal of information available on the factors which influence the breakdown and resorption of bone, information on factors which stimulate the formation of new bone is more limited.

The cascade of transcription factors and growth factors involved in the differentiation or progression from progenitor cell to functional osteoclast is well established. In contrast, little is known about the factors involved in the progression of progenitor cells into osteoblasts. The mesenchymal progenitor or stem cells (MPCs) represent the starting point for the differentiation of both osteoclasts and osteoblasts. During embryonic development in vivo, bone formation occurs through two distinct pathways: intramembranous and/or endochondral ossification (see FIG. 1; taken from Nakashima and de Crombrugghe, (2003)). During intramembranous ossification, flat bones such as those of the skull or clavicles, are formed directly from condensations of mesenchymal cells. During endochondral ossification, long bones, such as limb bones, are formed from a cartilage intermediate formed during mesenchymal condensation, which intermediate is invaded during further development by endothelial cells, osteoclasts and mesenchymal cells that further differentiate into osteoblasts and osteocytes. As osteoblasts differentiate from precursors to mature bone-forming cells, they express and secrete a number of enzymes and structural proteins of the bone matrix, including Type-1 collagen, osteocalcin, osteopontin and alkaline phosphatase (Stein et al 1990; Harris et al 1994). During the late stage of differentiation into osteoblasts, bone alkaline phosphatase activity (BAP) is up-regulated. Like alkaline phosphatase, osteocalcin and osteopontin, the BMPs are expressed by cultured osteoblasts as they proliferate and differentiate.

A limited number of compounds have been identified that are able to induce osteoblast differentiation in vitro, e.g., dexamethasone or by recombinant human secreted proteins, e.g., BMP-2 or BMP-7 (Service, 2000). BMPs are potent stimulators of bone formation in vitro and in vivo, however there are disadvantages to their use as therapeutic agents to enhance bone healing. Receptors for the bone morphogenetic proteins have been identified in many tissues, and the BMPs themselves are expressed in a large variety of tissues in specific temporal and spatial patterns. This suggests that BMPs may have effects on many tissues other than bone, potentially limiting their usefulness as therapeutic agents when administered systemically.

It is therefore important to identify agents that can induce osteoblast differentiation starting from pluripotent bone marrow mesenchymal progenitor cells or even from totipotent stem cells. Therefore, research has expanded into the identification of human secreted proteins and human receptor or mediator TARGETs that are involved in the specific modulation of differentiation of osteoblasts or of other cell types involved in bone homeostasis.

REPORTED DEVELOPMENTS

A number of treatments have been developed and made available to patients suffering from osteoporosis and related skeletal diseases. These therapeutic approaches primarily are directed to increasing net bone formation and include: hormone replacement therapy (HRT); selective estrogen receptor modulators (SERMs); bisphosphonates; and calcitonin. While these treatments slow down bone resorption, they don't abolish fracturing because the lost bone is not sufficiently replenished. Fracturing will be prevented only if bone formation is sufficiently increased. Therefore, there is great interest in identifying osteogenic pathways that enhance bone anabolism as a basis for therapeutic intervention.

Parathyroid hormone (PTH) 1-34 is the only bone anabolic therapy on the osteoporosis therapeutic market. While PTH displays bone anabolic effects when administered intermittently, it needs to be injected daily, and may have tumorgenic side effects, based on the observation that tumors form in animals treated with at PTH in high doses.

Bone morphogenetic proteins (BMPs) are another class of bone anabolic therapeutics, but have only been approved for niche markets. Receptors for the bone morphogenetic proteins have been identified in many tissues other than bone, and BMPs themselves are expressed in a large variety of tissues in specific temporal and spatial patterns. This suggests that BMPs may have effects on many tissues other than bone, potentially limiting their usefulness as therapeutic agents when administered systemically.

There is a clear need to identify additional targets that stimulate osteogenic differentiation and that can be used for the development of novel bone anabolic therapies.

The present invention relates to the relationship between the function of selected proteins identified by the present inventors (hereinafter referred to as “TARGETS”) and osteoblast differentiation in vertebrate cells.

SUMMARY OF THE INVENTION

The present invention relates to a method for identifying compounds that induce differentiation of undifferentiated vertebrate cells into osteoblasts, comprising contacting the compound with a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 377-599, 601-606, 867-1119, 1123-1133 under conditions that allow said polypeptide to bind to the compound, and measuring a compound-polypeptide property related to the differentiation of said cells into osteoblasts.

The present invention also relates to expression inhibitory agents, pharmaceutical compositions comprising the same, methods for the in vitro production of bone tissue, and host cells expressing said agents.

Aspects of the present method include the in vitro assay of compounds using polypeptide of a TARGET, and cellular assays wherein TARGET inhibition is followed by observing indicators of efficacy, including bone alkaline phosphatase secretion levels.

Another aspect of the invention is a method of treatment or prevention of a condition involving loss of bone density, in a subject suffering or susceptible thereto, by administering a pharmaceutical composition comprising an effective bone formation enhancing amount of a TARGET inhibitor.

A further aspect of the present invention is a pharmaceutical composition for use in said method wherein said inhibitor comprises a polynucleotide selected from the group of an antisense polynucleotide, a ribozyme, and a small interfering RNA (siRNA), wherein said inhibitor comprises a nucleic acid sequence complementary to, or engineered from, a naturally occurring polynucleotide sequence encoding a polypeptide, comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 377-418, 601, 867-1119, 1123-1133, or a fragment thereof.

Another further aspect of the present invention is a pharmaceutical composition comprising a therapeutically effective bone formation-enhancing amount of a TARGET inhibitor or its pharmaceutically acceptable salt, hydrate, solvate, or prodrug thereof in admixture with a pharmaceutically acceptable carrier. The present polynucleotides and TARGET inhibitor compounds are also useful for the manufacturing of a medicament for the treatment of conditions involving bone density loss.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1. Intramembranous and endochondral ossification.

FIG. 2. Principle of the osteoblast differentiation assay.

FIG. 3. Lay-out of the 96 well knock-down control plate.

FIG. 4. Lay-out of the 384 well control plate.

FIG. 5. Performance of the knock-down control plate in the AP assay

FIG. 6. Dot plot representation of raw data for one SilenceSelect screening plate

FIG. 7. Profiling of target expression in MPCs (A) and knock-down of gene expression by Ad-siRNA (B)

FIG. 8. Profiling of target expression in primary human OBs

FIG. 9. Analyzing the upregulation of BAP-mRNA versus PLAP- or IAP-mRNA

FIG. 10. Results mineralization assay

FIG. 11. Pipetting scheme used for screening the Ad-shRNAs at 3 MOIs.

DETAILED DESCRIPTION OF THE INVENTION

The following terms are used herein in accordance with the following definitions:

The term “agent” means any molecule, including polypeptides, polynucleotides and small molecules.

The term “agonist” refers to a ligand that stimulates the receptor the ligand binds to in the broadest sense.

The term “assay” means any process used to measure a specific property of a compound. A “screening assay” means a process used to characterize or select compounds based upon their activity from a collection of compounds.

The term “binding affinity” is a property that describes how strongly two or more compounds associate with each other in a non-covalent relationship. Binding affinities can be characterized qualitatively, (such as “strong”, “weak”, “high”, or “low”) or quantitatively (such as measuring the K_(D)).

The term “carrier” means a non-toxic material used in the formulation of pharmaceutical compositions to provide a medium, bulk and/or useable form to a pharmaceutical composition. A carrier may comprise one or more of such materials such as an excipient, stabilizer, or an aqueous pH buffered solution. Examples of physiologically acceptable carriers include aqueous or solid buffer ingredients including phosphate, citrate, and other organic acids; antioxidants including ascorbic acid; low molecular weight (less than about 10 residues) polypeptide; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt-forming counterions such as sodium; and/or nonionic surfactants such as TWEEN™, polyethylene glycol (PEG), and PLURONICS™

The term “complex” means the entity created when two or more compounds bind to each other.

The term “compound” is used herein in the context of a “test compound” or a “drug candidate compound” described in connection with the assays of the present invention. As such, these compounds comprise organic or inorganic compounds, derived synthetically or from natural sources. The compounds include inorganic or organic compounds such as polynucleotides, lipids or hormone analogs that are characterized by relatively low molecular weights. Other biopolymeric organic test compounds include peptides comprising from about 2 to about 40 amino acids and larger polypeptides comprising from about 40 to about 500 amino acids, such as antibodies or antibody conjugates.

The term “condition” or “disease” means the overt presentation of symptoms (i.e., illness) or the manifestation of abnormal clinical indicators (e.g., biochemical indicators). Alternatively, the term “disease” refers to a genetic or environmental risk of or propensity for developing such symptoms or abnormal clinical indicators.

The term “contact” or “contacting” means bringing at least two moieties together, whether in an in vitro system or an in vivo system.

The term “effective amount” or “therapeutically effective amount” means that amount of a compound or agent that will elicit the biological or medical response of a subject that is being sought by a medical doctor or other clinician. In particular, with regard to inducing undifferentiated vertebrate cells into osteoblasts, the term “effective amount” is intended to mean an effective differentiation-promoting amount of an compound or agent that will bring about a biologically meaningful increase in the levels of osteogenic markers, representative for the process of differentiation into osteoblasts.

The term “endogenous” shall mean a material that a mammal naturally produces. Endogenous in reference to the term “protease”, “kinase”, or G-Protein Coupled Receptor (“GPCR”) shall mean that which is naturally produced by a mammal (for example, and not limitation, a human). In contrast, the term non-endogenous in this context shall mean that which is not naturally produced by a mammal (for example, and not limitation, a human). Both terms can be utilized to describe both “in vivo” and “in vitro” systems. For example, and not a limitation, in a screening approach, the endogenous or non-endogenous TARGET may be in reference to an in vitro screening system. As a further example and not limitation, where the genome of a mammal has been manipulated to include a non-endogenous TARGET, screening of a candidate compound by means of an in vivo system is viable.

The term “expressible nucleic acid” means a nucleic acid coding for a proteinaceous molecule, an RNA molecule, or a DNA molecule.

The term “expression” comprises both endogenous expression and overexpression by transduction.

The term “expression inhibitory agent” means a polynucleotide designed to interfere selectively with the transcription, translation and/or expression of a specific polypeptide or protein normally expressed within a cell. More particularly, “expression inhibitory agent” comprises a DNA or RNA molecule that contains a nucleotide sequence identical to or complementary to at least about 17 sequential nucleotides within the polyribonucleotide sequence coding for a specific polypeptide or protein. Exemplary expression inhibitory molecules include ribozymes, double stranded siRNA molecules, self-complementary single-stranded siRNA molecules, genetic antisense constructs, and synthetic RNA antisense molecules with modified stabilized backbones.

The term “expressible nucleic acid” means a nucleic acid coding for a proteinaceous molecule, an RNA molecule, or a DNA molecule.

The term “GPCR” means a G-protein coupled receptor. Preferred GPCRs comprise those receptors identified by applicants as promoting osteogenic differentiation. Most preferred GPCRs are those identified in Tables 1 and 2, including the naturally occurring transcript variants thereof.

The term “hybridization” means any process by which a strand of nucleic acid binds with a complementary strand through base pairing. The term “hybridization complex” refers to a complex formed between two nucleic acid sequences by virtue of the formation of hydrogen bonds between complementary bases. A hybridization complex may be formed in solution (e.g., C_(0t) or R_(0t) analysis) or formed between one nucleic acid sequence present in solution and another nucleic acid sequence immobilized on a solid support (e.g., paper, membranes, filters, chips, pins or glass slides, or any other appropriate substrate to which cells or their nucleic acids have been fixed). The term “stringent conditions” refers to conditions that permit hybridization between polynucleotides and the claimed polynucleotides. Stringent conditions can be defined by salt concentration, the concentration of organic solvent, e.g., formamide, temperature, and other conditions well known in the art. In particular, reducing the concentration of salt, increasing the concentration of formamide, or raising the hybridization temperature can increase stringency.

The term “inhibit” or “inhibiting”, in relationship to the term “response” means that a response is decreased or prevented in the presence of a compound as opposed to in the absence of the compound.

The term “inhibition” refers to the reduction, down regulation of a process or the elimination of a stimulus for a process that results in the absence or minimization of the expression of a protein or polypeptide.

The term “induction” refers to the inducing, up-regulation, or stimulation of a process that results in the expression of a protein or polypeptide.

The term “ligand” means an endogenous, naturally occurring molecule specific for an endogenous, naturally occurring receptor.

The term “osteoblast differentiation” means the process of differentiation of undifferentiated cells (progenitor cells or precursor cells) into osteoblasts and/or preosteoblasts. The term “osteogenesis” is used as a synonym in this context. “Abnormal osteoblast differentiation” means a situation where either too much or too little osteoblast differentiation is occurring.

The term “pharmaceutically acceptable prodrugs” as used herein means the prodrugs of the compounds useful in the present invention, which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of patients with undue toxicity, irritation, allergic response commensurate with a reasonable benefit/risk ratio, and effective for their intended use of the compounds of the invention. The term “prodrug” means a compound that is transformed in vivo to yield an effective compound useful in the present invention or a pharmaceutically acceptable salt, hydrate or solvate thereof. The transformation may occur by various mechanisms, such as through hydrolysis in blood. The compounds bearing metabolically cleavable groups have the advantage that they may exhibit improved bioavailability as a result of enhanced solubility and/or rate of absorption conferred upon the parent compound by virtue of the presence of the metabolically cleavable group, thus, such compounds act as pro-drugs. A thorough discussion is provided in Design of Prodrugs, H. Bundgaard, ed., Elsevier (1985); Methods in Enzymology; K. Widder et al, Ed., Academic Press, 42, 309-396 (1985); A Textbook of Drug Design and Development, Krogsgaard-Larsen and H. Bandaged, ed., Chapter 5; “Design and Applications of Prodrugs” 113-191 (1991); Advanced Drug Delivery Reviews, H. Bundgard, 8, 1-38, (1992); J. Pharm. Sci., 77, 285 (1988); Chem. Pharm. Bull., N. Nakeya et al, 32, 692 (1984); Pro-drugs as Novel Delivery Systems, T. Higuchi and V. Stella, 14 A.C.S. Symposium Series, and Bioreversible Carriers in Drug Design, E. B. Roche, ed., American Pharmaceutical Association and Pergamon Press, 1987, which are incorporated herein by reference. An example of the prodrugs is an ester prodrug. “Ester prodrug” means a compound that is convertible in vivo by metabolic means (e.g., by hydrolysis) to an inhibitor compound according to the present invention. For example an ester prodrug of a compound containing a carboxy group may be convertible by hydrolysis in vivo to the corresponding carboxy group.

The term “pharmaceutically acceptable salts” refers to the non-toxic, inorganic and organic acid addition salts, and base addition salts, of compounds of the present invention. These salts can be prepared in situ during the final isolation and purification of compounds useful in the present invention.

The term “polynucleotide” refers to nucleic acids, such as double stranded, or single stranded DNA and (messenger) RNA, and all types of oligonucleotides. It also includes nucleic acids with modified backbones such as peptide nucleic acid (PNA), polysiloxane, and 2′-O-(2-methoxy)ethylphosphorothioate. “Derivatives of a polynucleotide” means DNA-molecules, RNA-molecules, and oligonucleotides that comprise a stretch or nucleic acid residues of the polynucleotide, e.g. polynucleotides that may have nucleic acid mutations as compared to the nucleic acid sequence of a naturally occurring form of the polynucleotide. A derivative may further comprise nucleic acids with modified backbones such as PNA, polysiloxane, and 2′-O-(2-methoxy)ethyl-phosphorothioate, non-naturally occurring nucleic acid residues, or one or more nucleic acid substituents, such as methyl-, thio-, sulphate, benzoyl-, phenyl-, amino-, propyl-, chloro-, and methanocarbanucleosides, or a reporter molecule to facilitate its detection. “Fragment of a polynucleotide” means oligonucleotides that comprise a stretch of contiguous nucleic acid residues that exhibit substantially a similar, but not necessarily identical, activity as the complete sequence.

The term “polypeptide” relates to proteins, proteinaceous molecules, fractions of proteins, peptides, oligopeptides, and enzymes (such as kinases, proteases, GCPRs). “Derivatives of a polypeptide” relate to those peptides, oligopeptides, polypeptides, proteins and enzymes that comprise a stretch of contiguous amino acid residues of the polypeptide and that retain the biological activity of the protein, e.g. polypeptides that have amino acid mutations compared to the amino acid sequence of a naturally-occurring form of the polypeptide. A derivative may further comprise additional naturally occurring, altered, glycosylated, acylated or non-naturally occurring amino acid residues compared to the amino acid sequence of a naturally occurring form of the polypeptide. It may also contain one or more non-amino acid substituents compared to the amino acid sequence of a naturally occurring form of the polypeptide, for example a reporter molecule or other ligand, covalently or non-covalently bound to the amino acid sequence. “Fragment of a polypeptide” relates to peptides, oligopeptides, polypeptides, proteins and enzymes that comprise a stretch of contiguous amino acid residues, and exhibit substantially similar, but not necessarily identical, functional activity as the complete sequence.

The term “solvate” means a physical association of a compound useful in this invention with one or more solvent molecules. This physical association includes hydrogen bonding. In certain instances the solvate will be capable of isolation, for example when one or more solvent molecules are incorporated in the crystal lattice of the crystalline solid. “Solvate” encompasses both solution-phase and isolable solvates. Representative solvates include hydrates, ethanolates and methanolates.

The term “subject” includes humans and other mammals.

The term “treating” means an intervention performed with the intention of preventing the development or altering the pathology of, and thereby alleviating a disorder, disease or condition, including one or more symptoms of such disorder or condition. Accordingly, “treating” refers to both therapeutic treatment and prophylactic or preventative measures. Those in need of treating include those already with the disorder as well as those in which the disorder is to be prevented. The related term “treatment,” as used herein, refers to the act of treating a disorder, symptom, disease or condition, as the term “treating” is defined above.

The term “undifferentiated mammalian cells” are pluripotent cells which are in an early stage of specialization, i.e. cells which do not yet have their final function and can be induced to form almost any given cell type. In particular, these are cells which have not yet differentiated to the specific bone cells osteoblasts or osteoclasts. Such pluripotent cells are especially blood cells and cells present in bone marrow, as well as cells derived from adipose tissue. In addition, cells which can be differentiated into mesenchymal precursor cells are contemplated in the present invention, such as, for example, totipotent stem cells such as embryonic stem cells.

The term “vectors” also relates to plasmids as well as to viral vectors, such as recombinant viruses, or the nucleic acid encoding the recombinant virus.

The term “vertebrate cells” means cells derived from animals having vertera structure, including fish, avian, reptilian, amphibian, marsupial, and mammalian species. Preferred cells are derived from mammalian species, and most preferred cells are human cells. Mammalian cells include feline, canine, bovine, equine, caprine, ovine, porcine murine, such as mice and rats, and rabbits.

Applicants' Invention Based on TARGET Relationship to Osteoblast Differentiation

As noted above, the present invention is based on the present inventors' discovery that TARGETS are factors in the up-regulation and/or induction of osteoblast differentiation. The term “TARGET” or “TARGETS” means the proteins identified in accordance with the present bone alkaline phosphatase assay to be involved in the induction osteoblast differentiation. The TARGETS are identified in Table 1 by gene name, gene symbol, genbank DNA/RNA accession number, genbank polypeptide accession number, and their associated SEQ ID NOS. Table 1 also provides knock-down target sequences and their associated SEQ ID NOS of the present invention. Table 1A provides additional KD TARGET Sequences for the TARGETS identified in Table 1.

The preferred TARGETS are identified in Table 2 by gene name, gene symbol, genbank DNA/RNA accession number, genbank polypeptide accession number, and their associated SEQ ID NOS. Table 2 also provides knock-down target sequences and their associated SEQ ID NOS of the present invention. Table 2A identifies exemplary protein domain fragments of the preferred polypeptide TARGETS identified in Table 2.

TABLE 1 DNA/ KD RNA PP TARGET SEQ Genbank SEQ Genbank SEQ TARGET Sequence ID TARGET TARGET Gene DNA/RNA ID Polypeptide ID Id (5′→ 3′) NO. Gene Name Symbol Accession NO. Accession NO. H24-049 GTACCTGC 1 arginine AVPR1B NM_000707 367 NP_000698 409 AGGTGCTC vasopressin AGC receptor 1B H24-225 ATGGGCTT 2 arginine AVPR1B NM_000707 367 NP_000698 409 CAACAGCC vasopressin ACC receptor 1B H24-001 CAACTTGT 3 G protein- GPR38 NM_001507 607 NP_001498 867 ACCTGGGC coupled AGC receptor 38 H24-002 GGTGAAGG 4 serine/threonine STK11, LKB1 NM_000455 608 NP_000446 868 AGGTGCTG kinase 11 GAC (Peutz-Jeghers syndrome) H24-003 GAATCTCT 5 hypothetical HSM801665, AL136697 609 AL136697's 1123 TCCGCAAG protein MGC8407 protein ATC MGC8407 NM_024046 610 NP_076951 869 H24-004 CATGCTGT 6 MAP kinase- MKNK2, SK236 348 SK236's protein 390 TTGAGAGC interacting MNK2 NM_017572 349 NP_060042 391 ATC serine/threonine NM_199054 350 NP_951009 392 kinase 2 H24-005 TTTGTGCT 7 calcitonin CALCRL NM_005795 611 NP_005786 870 GATTCCAT receptor-like GGC H24-006 GACGGTGT 8 casein kinase CSNK1G1, NM_00101166 356 NP_001011664 398 TAATGATA 1, gamma 1 CK1g1 (SK647) GCC NM_022048 357 NP_071331 399 H24-007 CTTCGGCA 9 myosin light HSA247087, SK536 368 SK536's protein 410 CTCCTGAG chain kinase caMLCK, NM_182493 369 NP_872299 411 TTC MLCK (AJ247087) H24-008 GCACAGTT 10 Rho- ROCK2 NM_004850 600 NP_004841 601 TGAGAAGC associated, AGC coiled-coil containing protein kinase 2 H24-009 ACGCAAAG 11 tRNA IPT NM_017646 612 NP_060116 871 TGGCCAGG isopentenyltransferase 1 AGC H24-010 CGATGTGC 12 protein kinase PRKCN, NM_005813 613 NP_005804 872 CTTCAAGA C, nu PKD3 SK489 614 SK489's protein 1124 TTC H24-011 GTGCACGG 13 membrane MPP6 NM_016447 615 NP_057531 873 ATTCAGAG protein, AGC palmitoylated 6 H24-012; CTTCTACA 14 G protein- TYMSTR NM_006564 616 NP_006555 874 H24-161 CGTCCATG coupled CTC receptor H24-013 CAACCTGC 15 opsin 3 OPN3 NM_014322 617 NP_055137 875 TGGTGCTC (encephalopsin, GTC panopsin) H24-014 CTCTCTTA 16 granzyme K GZMK NM_002104 362 NP_002095 404 GATCTGGA (serine ACC protease, granzyme 3; tryptase II) H24-015 AGCAGGAA 17 ubiquitin- AF073344, NM_006537 618 NP_006528 876 GGCGGACA specific USP3 TAC protease 3- ubiquitin specific protease 3 H24-016 CTCCAGCT 18 L-fucose FUK NM_145059 619 NP_659496 877 GAGTGAGC kinase AGC H24-017 TAAACCAG 19 hypothetical MGC26954 NM_145025 620 NP_659462 878 CAGAGGAG protein CTC MGC26954 H24-018 TCAGGTAG 20 coagulation F13A1 NM_000129 621 NP_000120 879 TTGGTTCT factor XIII, A1 GAC polypeptide H24-019 CTGCGCCG 21 proteasome PSMB3 NM_002795 622 NP_002786 880 AACAAATG (prosome, TAC macropain) subunit, beta type, 3 H24-020 TGTGGCGA 22 ClpX CLPX NM_006660 623 NP_006651 881 CTTGTGCA caseinolytic CAC protease X homolog (E. coli) H24-021 TCTCTCAG 23 hypothetical C13orf6, NM_032859 353 NP_116248 395 TGTAGAAT protein FLJ14906 GCC FLJ14906 H24-022 CCAGGAGG 24 HP43.8KD HP43.8KD NM_032557 624 NP_115946 882 TGAAACCA protein CAC H24-023 TCAGGCGA 25 ubiquitin USP9X NM_004652 625 NP_004643 883 CTACTTTA specific NM_021906 626 NP_068706 884 CTC protease 9, X chromosome (fat facets-like Drosophila) H24-024 GTGTACTG 26 matrix MMP23A, NM_004659 340 NP_004650 382 GTACAAGG metalloproteinase MMP23B NM_006983 341 NP_008914 383 ACC 23A- matrix metalloproteinase 23B H24-025 GAGCAGGT 27 HP43.8KD HP43.8KD NM_032557 627 NP_115946 885 TTCCAAAG protein GAC H24-026 TCTCTCAT 28 APEX APEX NM_001641 628 NP_001632 886 CAATACTG nuclease NM_080648 629 NP_542379 887 GTC (multifunctional NM_080649 630 NP_542380 888 DNA repair enzyme) H24-027 TGCAGAGC 29 a disintegrin- ADAMTS19 NM_133638 631 NP_598377 889 AGACAAGT like and GGC metalloprotease (reprolysin type) with thrombospondin type 1 motif, 19 H24-028 TCATGTTG 30 a disintegrin ADAM22 NM_004194 632 NP_004185 890 ACCAAGCA and NM_016351 633 NP_057435 891 AGC metalloproteinase NM_021721 634 NP_068367 892 domain 22 NM_021722 635 NP_068368 893 NM_021723 636 NP_068369 894 H24-029 CTATGCCA 31 LOC254378 LOC254378 XM_174812 637 XP_174812 895 TCACCTTC TGC H24-030 TGTGCCGA 32 similar to a LOC137491 XM_070459 638 XP_070459 896 AGGATGTA disintegrin and AGC metalloprotease domain 25 (testase 2) H24-031 CCGGGACA 33 similar to bile LOC138529 XM_070951 639 XP_070951 897 TAACTAAA salt-dependent TCC lipase oncofetal isoform H24-032 AGCAGGCT 34 complement C9 NM_001737 640 NP_001728 898 ATGGGATC component 9 AAC H24-033 CCACAAGG 35 xylulokinase XYLB NM_005108 641 NP_005099 899 TTGCAGCA homolog (H. influenzae) TTC H24-035 GGGCTCAG 36 chaperone, CABC1, NM_020247 642 NP_064632 900 CCAGGAGA ABC1 activity ADCK3 SK609 643 SK609's protein TTC of bc1 complex like (S. pombe) H24-036 CAGGTAGA 37 fyn-related FRK NM_002031 644 NP_002022 901 CATGGCGG kinase CAC H24-037 CTCTCCAG 38 G protein- GPR113 NM_153835 645 NP_722577 902 GACACTGA coupled CTC receptor 113 (GPR113) H24-038 GCACGATT 39 unc-51-like ULK1 NM_003565 646 NP_003556 903 TGGAGGTC kinase 1 (C. elegans) GCC H24-039 CGCTCTGG 40 neurotrophic NTRK1 NM_002529 647 NP_002520 904 AGTCTCTC tyrosine TCC kinase, receptor, type 1 H24-040 CCCCAACT 41 glycogen GSK3A NM_019884 648 NP_063937 905 ACACGGAG synthase TTC kinase 3 alpha H24-041 GGACTCTC 42 phosphoinositide- PIK3C2B NM_002646 376 NP_002637 418 AGTTCAGC 3-kinase, ATC class 2, beta polypeptide H24-042 CTTTGCGA 43 protein kinase, PRKR NM_002759 649 NP_002750 906 TACATGAG interferon- CCC inducible double stranded RNA dependent H24-043 CTTCCTGA 44 FUSED STK36, Fused AF200815 650 AF200815's 1125 AGACCAGG serine/threonine protein TTC kinase NM_015690 651 NP_056505 907 H24-044 GAATGCTG 45 mixed lineage HSA311797, AJ311797 652 AJ311797's 1126 GCAACAAG kinase 4alpha- HSA311798, protein ACC mixed lineage MLK4, SK691 653 SK691's protein 1127 kinase 4beta KIAA1804 NM_032435 654 NP_115811 908 H24-045 GAAGATGT 46 casein kinase CSNK1E, NM_001894 655 NP_001885 909 CAACGCCC 1, epsilon CK1e NM_152221 656 NP_689407 910 ATC H24-046 TTCTACGC 47 calcium- CASR NM_000388 657 NP_000379 911 ACCAGAAC sensing TCC receptor (hypocalciuric hypercalcemia 1, severe neonatal hyperparathyroidism) H24-047 TGACGGTT 48 gonadotropin- GNRHR NM_000406 658 NP_000397 912 GCATTTGC releasing CAC hormone receptor H24-048 CCAGACCT 49 adrenergic, ADRA1B NM_000679 659 NP_000670 913 CGAGCAAC alpha-1B-, TCC receptor H24-050 GGAGTGCA 50 dopamine DRD1 NM_000794 660 NP_000785 914 ATCTGGTT receptor D1 TAC H24-051 CAGTCAGT 51 dopamine DRD3 NM_000796 661 NP_000787 915 GCAACAGT receptor D3 NM_033658 662 NP_387507 916 GTC NM_033659- 663 NP_387508 917 NM_033663 664 NP_387512 918 H24-052 CGTGCTTG 52 opioid OPRD1 NM_000911 665 NP_000902 919 TCATGTTC receptor, delta 1 GGC H24-053 TGACAGGT 53 tachykinin TACR1 NM_001058 666 NP_001049 920 TCCGTCTG receptor 1 GGC H24-054 GTACCTGC 54 chemokine (C- CCR1 NM_001295 342 NP_001286 384 GGCAGTTG C motif) TTC receptor 1 H24-055 GACCATCA 55 frizzled FZD2 NM_001466 667 NP_001457 921 CCATCCTG homolog 2 GCC (Drosophila) H24-056 GCAGGCAG 56 bombesin-like BRS3 NM_001727 668 NP_001718 922 AGGACAGA receptor 3 TTC H24-057 CAAAGCCA 57 bombesin-like BRS3 NM_001727 669 NP_001718 923 TGCCCGTA receptor 3 AGC H24-058 AAGTGCCC 58 formyl peptide FPR1 NM_002029 670 NP_002020 924 TGGCCTTC receptor 1 TTC H24-059 CTACCACA 59 frizzled FZD5 NM_003468 671 NP_003459 925 AGCAGGTG homolog 5 TCC (Drosophila) H24-060; TGCGTGCT 60 smoothened SMOH NM_005631 672 NP_005622 926 H24-168 TCTTTGTG homolog GGC (Drosophila) H24-061 CTACGTCA 61 melanocortin 5 MC5R NM_005913 673 NP_005904 927 TCCTGTGC receptor CTC H24-062; TTCGGACA 62 retinal pigment RRH NM_006583 674 NP_006574 928 H24-166 CCCACAAA epithelium- TGC derived rhodopsin homolog H24-064; GTTGTCCT 63 olfactory OR1A2 NM_012352 364 NP_036484 406 H24-164 GTTCTGAC receptor, GTC family 1, subfamily A, member 2 H24-065 GCAGGCTT 64 paired basic PACE4 NM_002570 675 NP_002561 929 TCGAGTAT amino acid NM_138319 676 NP_612192 930 GGC cleaving NM_138320 677 NP_612193 931 system 4 NM_138321 678 NP_612194 932 NM_138322 679 NP_612195 933 NM_138323 680 NP_612196 934 NM_138324 681 NP_612197 935 NM_138325 682 NP_612198 936 H24-066 CCTCTCTG 65 leucine-rich LGR7 NM_021634 683 NP_067647 937 TCAACACA repeat- TGC containing G protein- coupled receptor 7 H24-067 ATGACGCT 66 beta-amyloid BBP NM_032027 684 NP_114416 938 ACGCAAGA binding protein ACC precursor H24-068 AGCGGGTG 67 proteasome PSMB5 NM_002797 685 NP_002788 939 CTTACATT (prosome, GCC macropain) subunit, beta type, 5 H24-069 GCAAGAAT 68 retinoic acid RARB NM_000965 686 NP_000956 940 GCACAGAG receptor, beta NM_016152 687 NP_057236 941 AGC H24-070 TTTGTGCT 69 similar to CTLA1 NM_033423 688 NP_219491 942 GACAGCTG granzyme B CTC (granzyme 2, cytotoxic T- lymphocyte- associated serine esterase 1) (H. sapiens) H24-071 CACCTGCT 70 KIAA1453 KIAA1453 NM_025090 689 NP_079366 943 TTCTCAAT protein GCC H24-072 GGTTCTCT 71 fetuin B FETUB NM_014375 690 NP_055190 944 GACTCGAA CAC H24-073 AGCACCTC 72 sentrin/SUMO- SENP3 NM_015670 691 NP_056485 945 GCTGACAT specific TCC protease 3 H24-074 CCTGGGCA 73 DKFZP586D2223 DKFZP586D2223 NM_018561 692 NP_061031 946 ACACCTGC protein TAC H24-075 CTTAAGGT 74 carboxypeptidase CPA6 NM_020361 693 NP_065094 947 GGACCTGT A6 GGC H24-076 TTGCACAG 75 putative SPPL2A NM_032802 694 NP_116191 948 AAAGGAGG intramembrane TGC cleaving protease H24-077 GCCCGCAG 76 similar to LOC121302 XM_062575 695 XP_062575 949 TCTTACAC protease AAC H24-078 GCTTCTGG 77 transglutaminase 6 TGM6 NM_198994 696 NP_945345 950 TGGAGAAG GAC H24-079 GTGTATGA 78 liver-specific LST-3 NM_001009562 1120 NP_001009562 951 AGTGGTCC organic anion ACC transporter 3 H24-080 GAAATCTC 79 similar to LOC160131 XM_090078 697 XP_090078 952 ACTGCTTC caspase 1, GAC isoform alpha precursor; interleukin 1- beta convertase; interleukin 1-B converting enzyme; IL1B- convertase H24-081 CACTTTAT 80 similar to LOC284964 XM_209423 698 XP_209423 953 AAGCCTGC bA395L14.5 GGC (novel phosphogluco mutase like protein) H24-082 TGGGCATC 81 LOC254378 LOC254378 XM_174812 699 XP_174812 954 CTGGCTGT AAC H24-083 ATAGACTG 82 complement C9 NM_001737 700 NP_001728 955 CAGAATGA component 9 GCC H24-084 CAGTGCCA 83 neuron NAV2 NM_018162 701 NP_060632 956 AGAAGGAG navigator 2 NM_145117 702 NP_660093 957 CCC H24-085 TGTGCTCG 84 highly charged D13S106E NM_005800 703 NP_005791 958 AAGGAGGA protein ATC D13S106E H24-086 ATGTATGG 85 butyrylcholinesterase BCHE NM_000055 704 NP_000046 959 ATTCCAGC ACC H24-087 GCTCTGCT 86 Hin-1 HSHIN1 NM_017493 705 NP_059963 960 ATGTGTCA NM_199324 706 NP_955356 961 GTC H24-088 TGTGACTA 87 polycystic PKDREJ NM_006071 707 NP_006062 962 AGCTGGAA kidney disease GAC (polycystin) and REJ (sperm receptor for egg jelly homolog, sea urchin)-like H24-089 TGCGCACA 88 protein PTPN1 NM_002827 708 NP_002818 963 ATACTGGC tyrosine CAC phosphatase, non-receptor type 1 H24-090 TTCCCGCT 89 glutamate GRIK4 NM_014619 709 NP_055434 964 ACCAGACC receptor, TAC ionotropic, kainate 4 H24-091 AGCATGGT 90 potassium KCNK9 NM_016601 710 NP_057685 965 CATTCACA channel, TCC subfamily K, member 9 H24-092 ATGCAGGT 91 transient TRPM6 NM_017662 711 NP_060132 966 CCATATGT receptor GAC potential cation channel, subfamily M, member 6 H24-093 CCTTTCTC 92 ataxia ATR NM_001184 712 NP_001175 967 TGAACACG telangiectasia GAC and Rad3 related H24-094 GTCAGGCT 93 p21(CDKN1A)- PAK6 NM_020168 374 NP_064553 416 GAATGAGG activated SK429 375 SK429's protein 417 AGC kinase 6 H24-095 CAGGTTCT 94 taste receptor, TAS1R3 XM_371210 713 XP_371210 968 CCTCAAAC type 1, GGC member 3 H24-096 GCATAGGA 95 similar to LOC223021 XM_167349 714 XP_167349 969 GTGGTCAT tensin ATC H24-097 ACATCCTG 96 thousand and TAO1, PSK NM_016151 351 NP_057235 393 CTGTCAGA one amino acid NM_004783 352 NP_004774 394 GCC protein kinase- prostate derived STE20-like kinase PSK H24-098 CATGGAGT 97 solute carrier SLC10A1 NM_003049 715 NP_003040 970 TCAGCAAG family 10 ATC (sodium/bile acid cotransporter family), member 1 H24-099 GTTCTCCA 98 solute carrier SLC16A3 NM_004207 366 NP_004198 408 GTGCCATT family 16 GGC (monocarboxylic acid transporters), member 3 H24-100 TTCGGCCT 99 organic ORCTL3 NM_004256 716 NP_004247 971 GGACGTCT cationic ATC transporter-like 3 H24-101 GTGCATTG 100 interleukin 5 IL5 NM_000879 717 NP_000870 972 GTGAAAGA (colony- GAC stimulating factor, eosinophil) H24-102 TGTGCAGG 101 transforming TGFB2 NM_003238 718 NP_003229 973 ATAATTGC growth factor, TGC beta 2 H24-103 AGGTGTCA 102 tumor necrosis TNFRSF10A NM_003844 719 NP_003835 974 CTGTACAG factor receptor TCC superfamily, member 10a H24-104 AGTGCGCA 103 fibroblast FGF14 NM_004115 720 NP_004106 975 TCTTCGGC growth factor CTC 14 H24-105 TTTGTGGA 104 Ras homolog RHEB2 NM_005614 721 NP_005605 976 CTCCTACG enriched in ATC brain 2 H24-106 GCCCTGAT 105 NADPH- NR1 NM_014434 722 NP_055249 977 GTCCATCT dependent TCC FMN and FAD containing oxidoreductase H24-107 CATAGGGA 106 interleukin 1 IL1F8 NM_014438 723 NP_055253 978 AGGACACT family, TGC member 8 (eta) H24-108 CCTGGATG 107 interleukin 1 IL1F8 NM_014438 724 NP_055253 979 TGAGAGAG family, AGC member 8 (eta) H24-109 AACTTGTA 108 Ras association RASSF2 NM_014737 725 NP_055552 980 CTATGAAG (RalGDS/AF- NM_170774 726 NP_739580 981 GCC 6) domain family 2 H24-110 GTATTCTG 109 androgen- ARSDR1 NM_016026 727 NP_057110 982 TACACCCT regulated GGC short-chain dehydrogenase/ reductase 1 H24-111 TTCTCGCA 110 peptidylprolyl PPIL1 NM_016059 728 NP_057143 983 ATGGCCAA isomerase TGC (cyclophilin)- like 1 H24-112 GAAGAACA 111 RAS, RASD1 NM_016084 365 NP_057168 407 GCAGCCTG dexamethasone- GAC induced 1 H24-113 TCAGGCGG 112 dicarbonyl/L- DCXR NM_016286 729 NP_057370 984 ATCTTGAC xylulose AGC reductase H24-114 TTCGGCAC 113 casein kinase CSNK2B NM_001320 730 NP_001311 985 TGGTTTCC 2, beta CTC polypeptide H24-115 GACGAATA 114 protein kinase, PRKAG2 NM_016203 731 NP_057287 986 TCAGCTCT AMP- GCC activated, gamma 2 non- catalytic subunit H24-116 CCTCTCTA 115 ATP-binding ABCG8 NM_022437 732 NP_071882 987 CGCCATCT cassette, sub- ACC family G (WHITE), member 8 (sterolin 2) H24-117 TCTCTCCA 116 chromosome C20orf121 NM_024331 733 NP_077307 988 CACAAACC 20 open TTC reading frame 121 H24-118 GGTCGGGA 117 organic cation OKB1 NM_033125 734 NP_149116 989 GGAGAACA transporter GTC OKB1 H24-119 GCGAATTC 118 solute carrier SLC26A8 NM_052961 735 NP_443193 990 CACCAGCA family 26, TTC member 8 H24-120 TGTCCAGG 119 UDP UGT1A1 NM_000463 736 NP_000454 991 ACCTATTG glycosyltransferase AGC 1 family, polypeptide A1 H24-121 TGACCATC 120 3-hydroxy-3- HMGCR NM_000859 737 NP_000850 992 TGCATGAT methylglutaryl- GTC Coenzyme A reductase H24-122 GCATGGCA 121 hydroxyprosta HPGD NM_000860 738 NP_000851 993 TAGTTGGA glandin TTC dehydrogenase 15-(NAD) H24-123 ATGCAGGA 122 phospholipase PLCG2 NM_002661 739 NP_002652 994 CATGAACA C, gamma 2 ACC (phosphatidylinositol- specific) H24-124 ATGTGTGA 123 thioredoxin TXNRD1 NM_182729 740 NP_877393 995 ATGTGGGT reductase 1 NM_003330 741 NP_003321 996 TGC NM_182742 742 NP_877419 997 NM_182743 743 NP_877420 998 H24-125 TGCAGGCT 124 UDP- B4GALT5 NM_004776 744 NP_004767 999 ATTCTGTG Gal:betaGlcNAc AGC beta 1,4- galactosyltransferase, polypeptide 5 H24-126 TCGGCACA 125 isocitrate IDH3B NM_174855 745 NP_777280 1000 ACAATCTA dehydrogenase NM_006899 746 NP_008830 1001 GAC 3 (NAD+) beta NM_174856 747 NP_777281 1002 H24-127 GACAGGTG 126 sialyltransferase SIAT4B NM_006927 748 NP_008858 1003 GACAGAGC 4B (beta- ATC galactosidase alpha-2,3- sialytransferase) H24-128 TGTGCGAG 127 HMT1 hnRNP HRMT1L3 NM_019854 343 NP_062828 385 ACCTCGAT methyltransferase- TTC like 3 (S. cerevisiae) H24-129 AGTTTGTG 128 UDP- B3GALT1 NM_020981 749 NP_066191 1004 TAGGTATC Gal:betaGlcNAc GCC beta 1,3- galactosyltransferase, polypeptide 1 H24-130 AGCATGAA 129 0- ENSG00000169, ENSG00000169066 750 ENSG00000169066's 1128 AGAAACCC peroxisomal DHRS4, NM_021004 751 protein TGC short-chain DHRS4L2 NM_198083 752 NP_066284 1005 alcohol NP_932349 1006 dehydrogenase H24-131 GAAGATCA 130 similar to PPIA, XM_292085 753 XP_292085 1007 CCATTGCT peptidylprolyl LOC341457 XM_497621 1121 XP_497621 1008 GAC isomerase A LOC126170, XM_371409 754 XP_371409 1009 (cyclophilin A)- LOC388817, NM_203431 755 NP_982255 1010 similar to LOC402102, XM_497870 756 XP_497870 1011 Peptidyl-prolyl LOC440892, XM_496579 757 XP_496579 1012 cis-trans LOC439953, XM_495800 758 XP_495800 1013 isomerase A LOC343384, NM_203430 759 NP_982254 1015 (PPIase) OAS2, XM_291544 760 XP_291544 1016 (Rotamase) LOC390299, NM_178230 761 NP_839944 1017 (Cyclophilin LOC388687, XM_372452 762, XP_372452 1018 A) LOC388686, XM_371304 763 XP_371304 1020 (Cyclosporin LOC128192, XM_371302 1122 XP_371302 1021 A-binding LOC392352 XM_060887 764 XP_060887 1022 protein) (SP18) XM_373301 765 XP_373301 1023 NM_021130 766 NP_066953 1024 767 H24-132 GCATGAAT 131 similar to PPIA, XM_497621 1121 XP_497621 1025 ATTGTGGA peptidylprolyl LOC126170, XM_371409 768 XP_371409 1026 GGC isomerase A LOC388817, NM_203431 769 NP_982255 1027 (cyclophilin A)- LOC402102, XM_497870 770 XP_497870 1028 similar to LOC391062, XM_372785 771 XP_372785 1029 Peptidyl-prolyl PPIA, NM_203430 772 NP_982254- 1030 cis-trans LOC390299, XM_372452 773 XP_372452 1031 isomerase A LOC391352, XM_372916 774 XP_372916 1032 (PPIase) LOC128192 XM_060887 775 XP_060887 1033 (Rotamase) NM_021130 776 NP_066953 1034 (Cyclophilin A) (Cyclosporin A-binding protein) (SP18) H24-133 TGCAGGCA 132 3-oxoacid CoA OXCT2 NM_022120 777 NP_071403 1035 AGCAGACG transferase 2 GTC H24-134 TGACGCAG 133 gycosyltransferase LOC83468 NM_031302 778 NP_112592 1036 ATGATGAA TCC H24-135 TGGCGCCA 134 histone HDAC10 NM_032019 779 NP_114408 1037 TGTCAGAG deacetylase 10 TGC H24-136 CTTATTGT 135 similar to LOC170327 XM_093255 780 XP_093255 1038 TCACATTG cytochrome P- GCC 450 H24-137 TGGCACCT 136 similar to LOC166624 XM_093980 781 XP_093980 1039 ATGAGAGG UDP- ATC glucuronosyltransferase H24-138 TCAGGTGT 137 interleukin-1 IRAK2 NM_001570 344 NP_001561 386 CCCATTCC receptor- SK180 345 SK180's protein 387 AGC associated kinase 2 H24-139 CTCAGAGG 138 IL2-inducible ITK NM_005546 782 NP_005537 1040 TGGTGGAA T-cell kinase GAC H24-140 TGCAGGAG 139 cytochrome AF182273, AF182273 783 AF182273's 1129 GAAATTGA P450, CYP3A3, NM_000776 784 protein TGC subfamily IIIA CYP3A4 NM_017460 785 NP_000767 1041 (niphedipine NP_059488 1042 oxidase), polypeptide 3- cytochrome P450, subfamily IIIA (niphedipine oxidase), polypeptide 4 H24-141 GAGTCCAG 140 cytochrome HUMCYPIIF, J02906 786 J02906's protein 1130 CCTTCATG P450, CYP2F1 NM_000774 787 NP_000765 1043 CCC subfamily IIF, polypeptide 1 H24-142 GTCCAGCT 141 glutamate GRIN2A NM_000833 339 NP_000824 381 GAAGAAGA receptor, TCC ionotropic, N- methyl D- aspartate 2A H24-143 TTCGGCAC 142 hypothetical FLJ22955 NM_024819 359 NP_079095 401 TGAGGTCT protein TGC FLJ22955 H24-144 TTGCACAC 143 hypothetical FLJ22955 NM_024819 866 NP_079095 1044 TGAGCTGG protein AGC FLJ22955 H24-145 CCTGCTCT 144 tumor TEM5 NM_032777 788 NP_116166 1045 TGAGCAAT endothelial AAC marker 5 precursor H24-146 TGTCCAGA 145 similar to LOC126537 XM_497611 789 XP_497611 1046 CCACATGG cytochrome AGC P450, subfamily IVF, polypeptide 2; leukotriene B4 omega- hydroxylase; leukotriene-B4 20- monooxygenase H24-147 TTGCAGGA 146 G protein- GPR153 NM_207370 790 NP_997253 1047 GGACAAGA coupled TGC receptor 153 H24-148 GATTGTGG 147 chloride CLIC6 XM_092804 335 XP_092804 377 CCAAGAAG intracellular NM_053277 336 NP_444507 378 TAC channel 6 H24-149 CCTCATTA 148 G protein- GPR150 XM_094471 360 XP_094471 402 TCACCATG coupled NM_199243 361 NP_954713 403 CTC receptor 150 H24-150 CTGGTTAT 149 FLJ16008 FLJ16008 NM_001001665 791 NP_001001665 1048 TGGCGGGT protein ATC H24-151 TTTGTGCT 150 G protein- GPR97 NM_170776 792 NP_740746 1049 TCACCAAG coupled TGC receptor 97 H24-152 CTGCACAG 151 similar to N- LOC256135 XM_172523 793 XP_172523 1050 TCAACACG formyl peptide GTC receptor H24-153 GCAGAGCC 152 LOC254502 LOC254502 XM_174355 794 XP_174355 1051 AAATATCA GCC H24-154 GTTCAAGA 153 opsin 1 (cone OPN1MW, NM_000513 795 NP_000504 1052 AGCTGCGC pigments), OPN1LW NM_020061 796 NP_064445 1053 CAC medium-wave- sensitive (color blindness, deutan)-opsin 1 (cone pigments), long-wave- sensitive (color blindness, protan) H24-155 CGTCTTCA 154 G protein- GPR30 NM_001505 797 NP_001496 1054 TCAGCGTG coupled CAC receptor 30 H24-156 GCAGTTCC 155 opsin 1 (cone OPN1SW NM_001708 798 NP_001699 1055 AAGCTTGC pigments), ATC short-wave- sensitive (color blindness, tritan) H24-157 GTACCTGC 156 chemokine (C- CCR3 NM_178329 354 NP_847899 396 GCCACTTC C motif) NM_001837 355 NP_001828 397 TTC receptor 3 H24-158 GACCATCA 157 frizzled FZD7 NM_003507 799 NP_003498 1056 CTATCCTG homolog 7 GCC (Drosophila) H24-159 GTCCTTCT 158 G protein- GPR23 NM_005296 337 NP_005287 379 ACATCAAT coupled GCC receptor 23 H24-160 GAAGAAGC 159 G protein- GPR64 NM_005756 338 NP_005747 380 AACTGGGA coupled GCC receptor 64 H24-162 GTTCCAGA 160 chemokine (C- CCR9 NM_006641 800 NP_006632 1057 CCTTCATG C motif) NM_031200 801 NP_112477 1058 TGC receptor 9 H24-163; CTGGACCG 161 adrenomedullin ADMR NM_007264 802 NP_009195 1059 H24-226 AGCTGCTT receptor GAC H24-165 GCAGAGCA 162 G protein- G2A NM_013345 803 NP_037477 1060 TGGGCTTA coupled AGC receptor H24-167; AGCAGGCG 163 calcium CACNB3 NM_000725 804 NP_000716 1061 H24-228 GAACATGT channel, TCC voltage- dependent, beta 3 subunit H24-169 CAACCTGT 164 galanin GALR2 NM_003857 371 NP_003848 413 TCATCCTT receptor 2 AAC H24-170 ATTTGGTG 165 chromosome C10orf112 XM_295865 805 XP_295865 1062 ACACGGCT 10 open GAC reading frame 112 H24-171 CATATGGC 166 similar to LOC121456 XM_062645 806 XP_062645 1063 TCTTCAAG solute carrier TAC family 9 (sodium/hydrogen exchanger), isoform 7; nonselective sodium potassium/proton exchanger H24-172 TGGCACAG 167 acetyl- ACAT1 NM_000019 807 NP_000010 1064 TAACAGCT Coenzyme A GCC acetyltransferase 1 (acetoacetyl Coenzyme A thiolase) H24-173 GTTCTCTC 168 placental PGF NM_002632 808 NP_002623 1065 AGCACGTT growth factor, CGC vascular endothelial growth factor- related protein H24-174 TGCAGACT 169 Rhesus blood RHAG NM_000324 809 NP_000315 1066 TCAGTGCA group- GCC associated glycoprotein H24-175 CTTTCTGG 170 solute carrier SLC39A1 NM_014437 810 NP_055252 1067 AAATCCTG family 39 (zinc CCC transporter), member 3 H24-176 CAACACAG 171 UDP-N-acetyl- GALGT NM_001478 811 NP_001469 1068 CAGACACA alpha-D- GTC galactosamine: (N- acetylneuraminyl)- galactosylglucosylceramide N- acetylgalactosaminyl- transferase (GalNAc-T) H24-177 TGGGACCA 172 glycosyl- GPLD1 NM_001503 812 NP_001494 1069 GTGACTGC phosphatidylinositol AGC specific phospholipase D1 H24-178 AGCCAGAG 173 HMT1 hnRNP HRMT1L1 NM_001535 813 NP_001526 1070 GAGTTTGT methyltransferase- NM_206962 814 NP_996845 1071 GGC like 1 (S. cerevisiae) H24-179 CTCGCAGG 174 GS3955 GS3955 NM_021643 815 NP_067675 1072 AAATTCTG protein GAC H24-180 ATGCAGGT 175 solute carrier SLC4A10 NM_022058 816 NP_071341 1073 CAGGTTGT family 4, TTC sodium bicarbonate transporter- like, member 10 H24-181 ATCAGGCC 176 phosphoprotein C8FW NM_025195 817 NP_079471 1074 TTACATCC regulated by AGC mitogenic pathways H24-182 CTGTGGGA 177 similar to LOC165927 XM_093541 818 XP_093541 1075 GAAACAGA hypothetical GAC protein, MNCb-4779 H24-183 CTCTGCGA 178 UDP- B3GALT6 NM_080605 819 NP_542172 1076 CTACTACC Gal:betaGal TGC beta 1,3- galactosyltransferase polypeptide 6 H24-184 CTGATGAA 179 similar to LOC123326 XM_063593 820 XP_063593 1077 GGCCTTCG NADH- ACC ubiquinone oxidoreductase PDSW subunit (Complex I- PDSW) (CI- PDSW) H24-185 ACCGTGGA 180 cytochrome CYP24 NM_000782 370 NP_000773 412 AGGCCTAT P450, CGC subfamily XXIV (vitamin D24- hydroxylase) H24-186 TTCCAGCT 181 hypothetical FLJ11149 NM_018339 821 NP_060809 1078 GATATATC protein CAC FLJ11149 H24-187 GCCAGACA 182 TTBK2 SK453 822 SK453's protein 1131 CTGACAAG NM_173500 823 NP_775771 1079 TTC H24-188 TCGGCAGG 183 macrophage MST1 NM_020998 824 NP_066278 1080 GCCAGCAT stimulating 1 TTC (hepatocyte growth factor- like) H24-189 GTCTTCGA 184 histidine-rich HRG NM_000412 825 NP_000403 1081 CCCTCAGG glycoprotein AAC H24-190 TCAGAAGG 185 KIAA0943 APG4B NM_013325 826 NP_037457 1082 TTGTGCAG protein NM_178326 827 NP_847896 1083 GAC H24-191 CAACTTGC 186 amyloid beta APP NM_201414 828 NP_958817 1084 ATGACTAC (A4) precursor NM_000484 829 NP_000475 1085 GGC protein NM_201413 830 NP_958816 1086 (protease nexin-II, Alzheimer disease) H24-192 TGTGCAAG 187 protein PPP2CB NM_004156 831 NP_004147 1087 AGGTTCGT phosphatase 2 TGC (formerly 2A), catalytic subunit, beta isoform H24-193 ACCAGTGG 188 dual specificity DUSP5 NM_004419 358 NP_004410 400 TAAATGTC phosphatase 5 AGC H24-194 CTCTGTAT 189 mitogen- MAP3K9 NM_033141 346 NP_149132 388 CCCATTCC activated XM_027237 347 XP_027237 389 CTC protein kinase kinase kinase 9 H24-195 CTTCTTGA 190 mitogen- MAP3K1 XM_042066 832 XP_042066 1088 AGCATCTA activated TGC protein kinase kinase kinase 1 H24-196 CATGCTGT 191 leucyl/cystinyl LNPEP NM_005575 833 NP_005566 1089 TGTCCTTT aminopeptidase ACC H24-197 CGAAGATG 192 ribonuclease L RNASEL NM_021133 834 NP_066956 1090 TTGACCTG (2′,5′- GTC oligoisoadenylate synthetase- dependent) H24-198 TGTCCTGT 193 protein kinase, PRKAA2 NM_006252 835 NP_006243 1091 TGGATGCA AMP- CAC activated, alpha 2 catalytic subunit H24-199 ATGCAGAC 194 tumor necrosis TNFRSF11A NM_003839 836 NP_003830 1092 CCTGGACC factor receptor AAC superfamily, member 11a, activator of NFKB H24-200 GTAGCACT 195 solute carrier SLC39A4 NM_017767 837 NP_060237 1093 CTGCGACA family 39 (zinc NM_130849 838 NP_570901 1094 TGC transporter), member 4 H24-201 CTGGAATG 196 succinate SDHC NM_003001 839 NP_002992 1095 GGATCCGA dehydrogenase CAC complex, subunit C, integral membrane protein, 15 kD H24-202 GTTATTCT 197 nicotinamide NNMT NM_006169 840 NP_006160 1096 TCCACCAT N- GGC methyltransferase H24-203 TGCCAGCA 198 ciliary CNTFR NM_001842 841 NP_001833 1097 GTCTCTTG neurotrophic ATC factor receptor H24-204 GATCTTCC 199 insulin-like IGFBP5 NM_000599 842 NP_000590 1098 GGCCCAAA growth factor CAC binding protein 5 H24-205 AGCATGAC 200 UDP-glucose UGCGL2 NM_020121 843 NP_064506 1099 AGGAAACC ceramide TGC glucosyltransferase- like 2 H24-206 TCTTCTCT 201 similar to LOC136234 XM_069782 844 XP_069782 1100 GTGAACAT NADH ACC dehydrogenase subunit 1 H24-207 CCTTGTTG 202 similar to AADAC NM_207365 845 NP_997248 1101 GCCAATGA Arylacetamide TTC deacetylase H24-208 CCAGGTTT 203 azurocidin 1 AZU1 NM_001700 846 NP_001691 1102 GTCAACGT (cationic GAC antimicrobial protein 37) H24-209 TTCCAGCT 204 similar to LOC161785 XM_091124 847 XP_091124 1103 CAGTGCTA microtubule- ATC associated proteins 1A/1B light chain 3 H24-210 AGCAGGAA 205 similar to LOC219756 XM_166676 848 XP_166676 1104 CATCTCTT MNK1 CGC H24-211 CAAGTTCT 206 ATPase, ATP4B NM_000705 849 NP_000696 1105 CCTGCAAG H+/K+ TTC exchanging, beta polypeptide H24-212 GAGCATGA 207 gamma- GABRR2 NM_002043 850 NP_002034 1106 CCTTCGAT aminobutyric GGC acid (GABA) receptor, rho 2 H24-213 CTGGCAGA 208 a disintegrin- ADAMTS1 NM_006988 851 NP_008919 1107 AGCAGCAC like and AAC metalloprotease (reprolysin type) with thrombospondin type 1 motif, 1 H24-214 TACCTGCT 209 fibroblast FGF4 NM_002007 852 NP_001998 1108 GGGCATCA growth factor 4 AGC (heparin secretory transforming protein 1, Kaposi sarcoma oncogene) H24-215 CTGGAAGT 210 interferon, IFNA8 NM_002170 853 NP_002161 1109 CCTGTGTG alpha 8 ATC H24-216 GGACACCT 211 interleukin 19 IL19 NM_013371 854 NP_037503 1110 TCCCAAAT NM_153758 855 NP_715639 1111 GTC H24-217 GGCAGAAA 212 solute carrier SLC10A2 NM_000452 856 NP_000443 1112 TTCCAGAG family 10 AGC (sodium/bile acid cotransporter family), member 2 H24-218 CAACATCC 213 glutathione GSR NM_000637 857 NP_000628 1113 CAACTGTG reductase GTC H24-219 TATCCTGA 214 potassium KCNG1 NM_002237 372 NP_002228 414 CCTTCCTG voltage-gated NM_172318 373 NP_758529 415 CGC channel, subfamily G, member 1 H24-220 TGTTTACC 215 fibroblast FGF21 NM_019113 858 NP_061986 1114 AGTCCGAA growth factor GCC 21 H24-221 AACTGTAC 216 similar to LOC131961 XM_067688 859 XP_067688 1115 CGCAGAGT INOSINE-5- TCC MONOPHOSPHATE DEHYDROGENASE 1 (IMP DEHYDROGENASE 1) (IMPDH-I) (IMPD 1) H24-222 AGCATGAT 217 topoisomerase TOP2B NM_001068 860 NP_001059 1116 GATAGTTC (DNA) II beta CTC (180 kD) H24-223 CAAGTGCC 218 SFRS protein SRPK1 NM_003137 861 NP_003128 1117 GTATCATC kinase 1 SK358 862 SK358's protein 1132 CAC H24-224 TATTCGTG 219 chromosome 9 SgK071, SK521 863 SK521's protein 1133 CGGAGGAA open reading C9orf96 NM_153710 864 NP_714921 1118 GAC frame 96 H24-227 GTACCTGC 220 procollagen- P4HB NM_000918 865 NP_000909 1119 TGGTGGAG proline, 2- TTC oxoglutarate 4- dioxygenase (proline 4- hydroxylase), beta polypeptide (protein disulfide isomerase; thyroid hormone binding protein p55)

TABLE 1A SEQ TARGET Genbank KD TARGET Sequence ID Gene DNA/RNA (5′→3′) NO. TARGET Gene Name Symbol Accession CGTTGGCAGAATCATTTAC 247 G protein-coupled receptor 38 GPR38 NM_001507 TTCGCGGATGATGTACTTC 248 G protein-coupled receptor 38 GPR38 NM_001507 CTCTCAGTACTTTAACATC 249 G protein-coupled receptor 38 GPR38 NM_001507 CATAACAAAGGCATCGCCC 250 MAP kinase-interacting serine/threonine MKNK2, NM_199054 kinase 2 MNK2 NM_017572 SK236 TTAATGATAGCCATCCAGC 251 casein kinase 1, gamma 1 CSNK1G1, NM_022048 CK1g1 SK647 ATTCCAGGCCATTTATGGC 252 granzyme K (serine protease, granzyme GZMK NM_002104 3; tryptase II) TGTTAGACTACGTGATGAC 253 hypothetical protein FLJ14906 FLJ14906 NM_032859 CAACCTCACCTACAGGATC 254 matrix metalloproteinase 23A-matrix MMP23A, NM_006983 metalloproteinase 23B MMP23B NM_004659 TCTACCCGATCAACCACAC 255 matrix metalloproteinase 23A-matrix MMP23A, NM_006983 metalloproteinase 23B MMP23B NM_004659 CCCTTGGAGGAACTATGCC 256 LOC254378 LOC254378 XM_174812 CAACTCAGACAACTGCATC 257 LOC254378 LOC254378 XM_174812 TCATTGTAAGGCTGTGGCC 258 similar to bile salt-dependent lipase LOC138529 XM_070951 oncofetal isoform GGACCAATGGGAGATAGAC 259 fyn-related kinase FRK NM_002031 AGCTTATCCAGCTTTATGC 260 fyn-related kinase FRK NM_002031 GTGCATTAACAAGAAGAAC 261 unc-51-like kinase 1 (C. elegans) ULK1 NM_003565 ACCTGCAGCCTTCACTTTC 262 chemokine (C-C motif) receptor 1 CCR1 NM_001295 TCCCTTCTGGATCGACTAC 263 chemokine (C-C motif) receptor 1 CCR1 NM_001295 CAATTATGAGTCCACGGTC 264 olfactory receptor, family 1, subfamily OR1A2 NM_012352 A, member 2 NM_014565 AACGATGGGCATGTATTTC 265 olfactory receptor, family 1, subfamily OR1A2 NM_012352 A, member 2 TGTCTCCTATGTTCAGGTC 266 olfactory receptor, family 1, subfamily OR1A2 NM_012352 A, member 2 GTATGGACAGAACTGGCTC 267 sentrin/SUMO-specific protease 3 SENP3 NM_015670 GATGAACATGTATGGAGAC 268 sentrin/SUMO-specific protease 3 SENP3 NM_015670 ATTCCTTCAAACGTATGGC 269 sentrin/SUMO-specific protease 3 SENP3 NM_015670 GCTCCTGGAGAACATGTAC 270 taste receptor, type 1, member 3 TAS1R3 XM_371210 ACCAACCTCAGAGGTTCTC 271 thousand and one amino acid protein TAO1 NM_016151 kinase-prostate derived STE20-like NM_004783 kinase PSK AAGCGGACCTACAAACTTC 272 thousand and one amino acid protein TAO1 NM_016151 kinase-prostate derived STE20-like NM_004783 kinase PSK CGTCTACATGTACGTGTTC 273 solute carrier family 16 (monocarboxylic SLC16A3 NM_004207 acid transporters), member 3 GTGTGTACATCAACTGTTC 274 androgen-regulated short-chain ARSDR1 NM_016026 dehydrogenase/reductase 1 GGCACAGTCCAATCTGAAC 275 androgen-regulated short-chain ARSDR1 NM_016026 dehydrogenase/reductase 1 CGCAAGTTCTACTCCATCC 276 RAS, dexamethasone-induced 1 RASD1 NM_016084 GGTGTTCAGTCTGGACAAC 277 RAS, dexamethasone-induced 1 RASD1 NM_016084 GTGTTCAGTCTGGACAACC 278 RAS, dexamethasone-induced 1 RASD1 NM_016084 ACTTGAACTCTCTCCACAC 279 chromosome 20 open reading frame 121 C20orf121 NM_024331 GTCTTCAATAACTTGAAGC 280 chromosome 20 open reading frame 121 C20orf121 NM_024331 CCACAACAAGCACGTGTTC 281 HMT1 hnRNP methyltransferase-like 3 HRMT1L3 NM_019854 (S. cerevisiae) ATCAATCGAAAGATTCTTC 282 interleukin-1 receptor-associated kinase 2 IRAK2 NM_001570 SK180 CGACGTTGACAATTCCAGC 283 interleukin-1 receptor-associated kinase 2 IRAK2 NM_001570 SK180 GCAGAGTTGCAGATTTGTC 284 interleukin-1 receptor-associated kinase 2 IRAK2 NM_001570 SK180 TCAGCATTCCTACGATAAC 285 glutamate receptor, ionotropic, N-methyl GRIN2A NM_000833 D-aspartate 2A CCGGCAGAAGGATAACCTC 286 glutamate receptor, ionotropic, N-methyl GRIN2A NM_000833 D-aspartate 2A CCAGAACTGTGAAGTTTAC 287 glutamate receptor, ionotropic, N-methyl GRIN2A NM_000833 D-aspartate 2A GCATGGCAAGAAAGTTAAC 288 glutamate receptor, ionotropic, N-methyl GRIN2A NM_000833 D-aspartate 2A AGCATGTTATGCCTTATGC 289 glutamate receptor, ionotropic, N-methyl GRIN2A NM_000833 D-aspartate 2A TCATTGTTTCTGCCATAGC 290 glutamate receptor, ionotropic, N-methyl GRIN2A NM_000833 D-aspartate 2A GATCTTTAACCAGCCTGAC 291 hypothetical protein FLJ22955 FLJ22955 NM_024819 GCACACCGTGGTAGTATAC 292 hypothetical protein FLJ22955 FLJ22955 NM_024819 GTCCTTCCACATCAAGAAC 293 tumor endothelial marker 5 precursor TEM5 NM_032777 TGCAACCTCTTACCCAAGC 294 chloride intracellular channel 6 CLIC6 NM_053277 CTCAATCCCTTCGTCTACC 295 G protein-coupled receptor 150 GPR150 NM_199243 CGTGGTCTACGCGTTCTAC 296 LOC167417 XM_094471 XM_094471 CATTATCACCATGCTCGGC 297 G protein-coupled receptor 150 GPR150 NM_199243 TCTCTCTTCCTATCAATCC 298 chemokine (C-C motif) receptor 3 CCR3 NM_178329 NM_001837 CCAAACGTGTCTGGAAGAC 299 G protein-coupled receptor 23 GPR23 NM_005296 GTACCTGTAGCCATCTAAC 300 G protein-coupled receptor 64 GPR64 NM_005756 GCTAGTGAATAATGATTGC 301 G protein-coupled receptor 64 GPR64 NM_005756 ACACGACTATAAGTCTAAC 302 G protein-coupled receptor 64 GPR64 NM_005756 ACATTGCAATGGACAACAC 303 KIAA0943 protein APG4B NM_013325 NM_178326 GGAATATCCTGAGTGTTGC 304 dual specificity phosphatase 5 DUSP5 NM_004419 TGCCAGAGGGATGAACTAC 305 mitogen-activated protein kinase kinase MAP3K9 NM_033141 kinase 9 ATGGAAGACTGCTGGAATC 306 mitogen-activated protein kinase kinase MAP3K9 NM_033141 kinase 9 GAGCGCTTCAAACGAGATC 307 mitogen-activated protein kinase kinase MAP3K9 NM_033141 kinase 9 ACCTGTCCCTAGATTCTTC 308 KIAA0943 protein APG4B NM_013325 ACGCATCTTGGCAAAGAGC 309 casein kinase 1, gamma 1 CSNK1G1 - NM_022048 CK1g1 SK647 ATTCCAGGGTTTATGTGTC 310 peptidylprolyl isomerase A PPIA, XM_372328 LOC390006, XM_371409 LOC388817, NM_203431 LOC442744, XM_499491 LOC342541, XM_292596 LOC344178, XM_292963 LOC388687, XM_371304 LOC391352, XM_372916 LOC256374, XM_170597 LOC388686, XM_371302 LOC122335, NM_021130 LOC390827, XM_063084 LOC390956, XM_497571 LOC442362, XM_372741 LOC343384, NM_203430 COAS2, XM_498254 LOC44006, XM_291544 LOC392352 NM_178230 XM_495896 XM_373301 XM_060887 XM_377444 CAACAGTGCATCTCTTATC 311 liver-specific organic anion transporter 3 LST-3 NM_001009562 (XM_292093) CAGCATCTACCTCCTGAAC 312 chemokine (C-C motif) receptor 1 CCR1 NM_001295 CAGCGCTCTCAATCCCTTC 313 G protein-coupled receptor 150 GPR150 NM_199243 CATCGACTATATAGCAGGC 314 carboxyl ester lipase (bile salt-stimulated CEL NM_001807 lipase) CCAAGAGTCTATTCAAAGC 315 olfactory receptor, family 1, subfamily OR1A2 NM_012352 A, member 2 CCACTAATGTCAACAATGC 316 G protein-coupled receptor 23 GPR23 NM_005296 CCACTCGTCAGATGTTTGC 317 LOC254378 LOC254378 XM_174812 CCCTGTCATTGATGGAGAC 318 carboxyl ester lipase (bile salt-stimulated CEL NM_001807 lipase) CCGAGCCATATACTTGACC 319 chromosome 20 open reading frame 121 C20orf121 NM_024331 CCTAGAGCTGATTGAGTTC 320 MAP kinase-interacting serine/threonine MKNK2 - NM_199054 kinase 2 MNK2 NM_017572 SK236 CCTCGACACCAAGTCTTGC 321 RAS, dexamethasone-induced 1 RASD1 NM_016084 CGCTCTTTAACATGAATGC 322 thousand and one amino acid protein TAO1 NM_016151 kinase-prostate derived STE20-like NM_004783 kinase PSK CGTGGACATGGAGTACGAC 323 taste receptor, type 1, member 3 TAS1R3 XM_371210 CTCGTAATGAGACTATAGC 324 androgen-regulated short-chain ARSDR1 NM_016026 dehydrogenase/reductase 1 CTGCAAATCTTCAGGTTTC 325 G protein-coupled receptor 64 GPR64 NM_005756 GAAGCACGATTTGGAGGTC 326 unc-51-like kinase 1 (C. elegans) ULK1 NM_003565 GATGATGAAGGAGACGTTC 327 hypothetical protein FLJ22955 FLJ22955 NM_024819 GATTTGGTTATAAGGGTTC 328 peptidylprolyl isomerase A LOC126170 XM_497621 LOC388817 XM_371409 PPIA NM_203431 KBTBD9 XM_496546 LOC256374 XM_170597 LOC131055 XM_067176 LOC390956 NM_021130 LOC391062 XM_372741 LOC343384 XM_372785 LOC401859 NM_203430 XM_291544 XM_377444 GCTACTGCCCTATATGATC 329 solute carrier family 39 (zinc SLC39A4 NM_017767 transporter), member 4 NM_130849 TCCGGTTCTATTTGATCGC 330 tumor endothelial marker 5 precursor TEM5 NM_032777 TCGCCCTTCCTATTCCTTC 331 mitogen-activated protein kinase kinase MAP3K9 NM_033141 kinase 9 TGTACGTGTTCATCCTGGC 332 solute carrier family 16 (monocarboxylic SLC16A3 NM_004207 acid transporters), member 3 TGTGACATTATGCCTTTGC 333 olfactory receptor, family 1, subfamily OR1A2 NM_012352 A, member 2

TABLE 2 KD TARGET TARGET Genbank DNA/RNA Genbank TARGET SEQ ID Gene DNA/RNA SEQ ID Polypeptide Polypeptide Id NO. Symbol Class Accession NO. Accession SEQ ID NO. H24-148 147 CLIC6 Ion Channel XM_092804 335 XP_092804 377 NM_053277 336 NP_444507 378 H24-159 158 GPR23 GPCR NM_005296 337 NP_005287 379 H24-160 159 GPR64 GPCR NM_005756 338 NP_005747 380 H24-142 141 GRIN2A Receptor NM_000833 339 NP_000824 381 H24-024 26 MMP23A Protease NM_004659 340 NP_004650 382 MMP23B NM_006983 341 NP_008914 383 H24-054 54 CCR1 GPCR NM_001295 342 NP_001286 384 H24-128 127 HRMT1L3 Enzyme NM_019854 343 NP_062828 385 H24-138 137 IRAK2 Kinase NM_001570 344 NP_001561 386 SK180 345 SK180's protein 387 H24-194 189 MAP3K9 Kinase NM_033141 346 NP_149132 388 XM_027237 347 XP_027237 389 H24-004 6 MKNK2 Kinase SK236 348 SK236's protein 390 NM_017572 349 NP_060042 391 NM_199054 350 NP_951009 392 H24-097 96 TAOK2, Kinase NM_016151 351 NP_057235 393 PSK, NM_004783 352 NP_004774 394 TAO1 H24-021 23 C13orf6, Protease NM_032859 353 NP_116248 395 FLJ14906 H24-157 156 CCR3 GPCR NM_178329 354 NP_847899 396 NM_001837 355 NP_001828 397 H24-006 8 CSNK1G1 Kinase NM_001011664 356 NP_001011664 398 (SK647) NM_022048 357 NP_071331 399 H24-193 188 DUSP5 Phosphatase NM_004419 358 NP_004410 400 H24-143 142 FLJ22955 Kinase NM_024819 359 NP_079095 401 H24-149 148 GPR150 GPCR XM_094471 360 XP_094471 402 NM_199243 361 NP_954713 403 H24-014 16 GZMK Protease NM_002104 362 NP_002095 404 H24-064; 63 OR1A1 GPCR NM_014565 363 NP_055380 405 H24-164 H24-064; 63 OR1A2 GPCR NM_012352 364 NP_036484 406 H24-164 H24-112 111 RASD1 Enzyme NM_016084 365 NP_057168 407 H24-099 98 SLC16A3 Transporter NM_004207 366 NP_004198 408 H24-049 1 AVPR1B GPCR NM_000707 367 NP_000698 409 H24-007 9 caMLCK Kinase SK536 368 SK536's protein 410 NM_182493 369 NP_872299 411 (AJ247087) H24-185 180 CYP24A1 Cytochrome NM_000782 370 NP_000773 412 P450 H24-169 164 GALR2 GPCR NM_003857 371 NP_003848 413 H24-219 214 KCNG1 Ion Channel NM_002237 372 NP_002228 414 NM_172318 373 NP_758529 415 H24-094 93 PAK6 Kinase NM_020168 374 NP_064553 416 SK429 375 SK429's protein 417 H24-041 42 PIK3C2B Kinase NM_002646 376 NP_002637 418 H24-008 10 ROCK2 Kinase NM_004850 600 NP_004841 601

TABLE 2A Seq ID protein Accession Name Protein Segment segment NP_444507 CLIC6 O—ClC: intracellular 419 chloride channel protein NP_005287 GPR23 Extracellular domain 420 Transmembrane 421 domain Intracellular domain 422 Transmembrane 423 domain Extracellular domain 424 Transmembrane 425 domain Intracellular domain 426 Transmembrane 427 domain Extracellular domain 428 Transmembrane 429 domain Intracellular domain 430 Transmembrane 431 domain Extracellular domain 432 Transmembrane 433 domain Intracellular domain 434 NP_005747 GPR64 Extracellular domain 435 Transmembrane 436 domain Intracellular domain 437 Transmembrane 438 domain Extracellular domain 439 Transmembrane 440 domain Intracellular domain 441 Transmembrane 442 domain Extracellular domain 443 Transmembrane 444 domain Intracellular domain 445 Transmembrane 446 domain Extracellular domain 447 Transmembrane 448 domain Intracellular domain 449 NP_000824 GRIN2A Lig_chan 450 NP_004650 MMP23A ZnMc 451 Peptidase_M10 452 ShKToxin domain 453 Immunoglobulin 454 NP_008914 MMP23B ZnMc 455 Peptidase_M10 456 ShKToxin domain 457 Immunoglobulin 458 NP_001286 CCR1 Extracellular domain 459 Transmembrane 460 domain Intracellular domain 461 Transmembrane 462 domain Extracellular domain 463 Transmembrane 464 domain Intracellular domain 465 Transmembrane 466 domain Extracellular domain 467 Transmembrane 468 domain Intracellular domain 469 Transmembrane 470 domain Extracellular domain 471 Transmembrane 472 domain Intracellular domain 473 NP_062828 HRMT1L3 Predicted RNA 474 methylase NP_001561 IRAK2 Death domain 475 SK180's protein protein kinase 476 NP_149132 MAP3K9 SH3_1 477 XP_027237 protein kinase 478 SK236's protein MKNK2 protein kinase 479 NP_060042 MKNK2 protein kinase 480 NP_951009 NP_057235 TAOK2 = PSK = protein kinase 481 NP_004774 TAO1 NP_116248 C13orf6 = Alpha/beta hydrolase 482 FLJ14906 fold-1 NP_847899 CCR3 Rhodopsin-like GPCR 483 NP_001828 superfamily Extracellular domain 484 Transmembrane 485 domain Intracellular domain 486 Transmembrane 487 domain Extracellular domain 488 Transmembrane 489 domain Intracellular domain 490 Transmembrane 491 domain Extracellular domain 492 Transmembrane 493 domain Intracellular domain 494 Transmembrane 495 domain Extracellular domain 496 Transmembrane 497 domain Intracellular domain 498 NP_001011664 CSNK1G1 protein kinase 499 NP_071331 NP_004410 DUSP5 Rhodanese-like 500 Dual specificity protein 501 phosphatase NP_079095 FLJ22955 Dephospho-CoA kinase 502 XP_094471 GPR150 Intracellular domain 503 Transmembrane 504 domain Extracellular domain 505 Transmembrane 506 domain Intracellular domain 507 Transmembrane 508 domain Extracellular domain 509 Transmembrane 510 domain Intracellular domain 511 NP_954713 GPR150 Extracellular domain 512 Transmembrane 513 domain Intracellular domain 514 Transmembrane 515 domain Extracellular domain 516 Transmembrane 517 domain Intracellular domain 518 Transmembrane 519 domain Extracellular domain 520 Transmembrane 521 domain Intracellular domain 522 NP_002095 GZMK Peptidase S1 and S6, 523 chymotrypsin/Hap NP_055380 OR1A1 Extracellular domain 524 Transmembrane 525 domain Intracellular domain 526 Transmembrane 527 domain Extracellular domain 528 Transmembrane 529 domain Intracellular domain 530 Transmembrane 531 domain Extracellular domain 532 Transmembrane 533 domain Intracellular domain 534 Transmembrane 535 domain Extracellular domain 536 Transmembrane 537 domain Intracellular domain 538 NP_036484 OR1A2 Extracellular domain 539 Transmembrane 540 domain Intracellular domain 541 Transmembrane 542 domain Extracellular domain 543 Transmembrane 544 domain Intracellular domain 545 Transmembrane 546 domain Extracellular domain 547 Transmembrane 548 domain Intracellular domain 549 Transmembrane 550 domain Extracellular domain 551 Transmembrane 552 domain Intracellular domain 553 NP_057168 RASD1 Ras small GTPase, Ras 554 type NP_004198 SLC16A3 Major facilitator 555 superfamily MFS_1 NP_000698 AVPR1B Extracellular domain 556 Transmembrane 557 domain Intracellular domain 558 Transmembrane 559 domain Extracellular domain 560 Transmembrane 561 domain Intracellular domain 562 Transmembrane 563 domain Extracellular domain 564 Transmembrane 565 domain Intracellular domain 566 Transmembrane 567 domain Extracellular domain 568 Transmembrane 569 domain Intracellular domain 570 SK536's protein caMLCK Protein kinase 571 NP_872299 caMLCK Serine/threonine 572 protein kinase NP_000773 CYP24A1 Cytochrome P450 573 NP_003848 GALR2 Extracellular domain 574 Transmembrane 575 domain Intracellular domain 576 Transmembrane 577 domain Extracellular domain 578 Transmembrane 579 domain Intracellular domain 580 Transmembrane 581 domain Extracellular domain 582 Transmembrane 583 domain Intracellular domain 584 Transmembrane 585 domain Extracellular domain 586 Transmembrane 587 domain Intracellular domain 588 NP_002228 KCNG1 K+ channel 589 tetramerisation Ion transport 590 NP_758529 KCNG1 K+ channel 591 tetramerisation NP_064553 PAK6 PAK-box/P21-Rho- 592 SK429's protein binding Serine/threonine 593 protein kinase NP_002637 PIK3C2B Phosphoinositide 3- 594 kinase, ras-binding Phosphoinositide 3- 595 kinase, C2 Phosphoinositide 3- 596 kinase accessory region PIK Phosphatidylinositol 3- 597 and 4-kinase, catalytic Phox-like 598 C2 599 NP_004841 ROCK2 Serine/threonine 602 protein kinase Protein kinase, C- 603 terminal PKN/rhophilin/rhotekin 604 rho-binding repeat Pleckstrin-like 605 Protein kinase C, 606 phorbol ester/diacylglycerol binding

Table 3 lists the preferred loop sequence for a shRNA.

TABLE 3 Name Sequence SEQ ID NO: Loop region GTTTGCTATAAC 334

The present invention relates to a method for assaying for compounds that induce osteoblast differentiation, comprising contacting the compound with a polypeptide comprising an amino acid sequence of the polypeptides of SEQ ID NO: 377-599, 601-606, 867-1119, 1123-1133 (“TARGETS”) under conditions that allow said polypeptide to bind to the compound, and detecting the formation of a complex between the polypeptide and the compound. One preferred means of measuring the complex formation is to determine the binding affinity of said compound to said polypeptide.

More particularly, the invention relates to a method for identifying an agent that induces differentiation of undifferentiated mammalian cells into osteoblasts, the method comprising further:

-   -   (a) contacting a population of undifferentiated vertebrate cells         with one or more of said compound that exhibits binding affinity         for said TARGETS, and     -   (b) measuring a compound-polypeptide property related to the         differentiation of said cells into osteoblasts.

The compound-polypeptide property referred to above is related to the differentiation of cells into osteoblasts, and is a measurable phenomenon chosen by the person of ordinary skill in the art. The measurable property may e.g. be the binding affinity for a peptide domain of the polypeptide TARGET or the level of any one of a number of biochemical marker levels of osteoblast differentiation. Osteoblast differentiation can e.g. be measured by measuring the level of enzymes that are induced during the differentiation process, such as alkaline phosphatase, type-1 collagen, osteocalcin and osteopontin. The alkaline phosphatase activity can be measured by adding methylumbelliferyl heptaphosphate (MUP) solution (Sigma) to the cells. The fluorescence generated upon cleavage of the MUP substrate by the AP activity is measured on a fluorescence plate reader (Fluostar, BMG).

In a preferred embodiment of the invention, the polypeptide TARGET comprises an amino acid sequence selected from the group consisting of SEQ ID NO: 377-599, 601-606, 867-1119, 1123-1133 (Tables 1, 2, and 2A). In another preferred embodiment of the invention, the polypeptide TARGET comprises an amino acid sequence selected from the group consisting of SEQ ID NO: 377-599, 601-606 (Tables 2 and 2A).

A preferred class of the polypeptides used as TARGETS are G-Protein Coupled Receptors (GPCR), wherein the expression and/or activity of said GPCR may be measured by determining the level of any one of the second messengers cyclic AMP, Ca²⁺ or both. Preferably, the level of the second messenger is determined with a reporter gene under the control of a promoter that is responsive to the second messenger. More preferably, the promoter is a cyclic AMP-responsive promoter, an NF-KB responsive promoter, or a NF-AT responsive promoter. In another preferred embodiment, the reporter gene is selected from the group consisting of: alkaline phosphatase, GFP, eGFP, dGFP, luciferase and b-galactosidase.

Other preferred classes of polypeptides used as TARGETS include kinases and phosphatases. Kinases are enzymes that transfer phosphate groups from high-energy donor molecules, such as ATP, to specific target molecules (substrates); the process is termed phosphorylation. Phosphatases remove phosphate groups from substrates. The activity of kinases or phosphatases may be measured by determining the level of phosphorylation or dephosphorylation of a substrate of said polypeptide. It is well known in the art how to measure this activity by using the respective substrate and to perform assays in which the substrate gets phosphorylated or dephosphorylated upon activation of the kinase or phosphatase. This means that the activity of the kinase or phosphatase can easily be scored through the phosphorylation status of its substrate.

Another preferred class of polypeptides used as TARGETS are proteases. Proteases are enzymes that break peptide bonds between amino acids of proteins; the process is called proteolytic cleavage. Protease activity can be measured through the level of cleavage of the respective substrate, which is a preferred method according to the invention to determine the activity level of the protease. Classically, substrates are used in which a fluorescent group is linked to a quencher through a peptide sequence that is a substrate that can be cleaved by the target protease. Cleavage of the linker separates the fluorescent group and quencher, giving rise to an increase in fluorescence.

Another preferred class of polypeptides used as TARGETS are ion channels. Ion channels are membrane protein complexes and their function is to facilitate the diffusion of ions across biological membranes. Membranes, or phospholipid bilayers, build a hydrophobic, low dielectric barrier to hydrophilic and charged molecules. Ion channels provide a high conducting, hydrophilic pathway across the hydrophobic interior of the membrane. The activity of an ion channel can be measured using classical patch clamping. High-throughput fluorescence-based or tracer-based assays are also widely available to measure ion channel activity. These fluorescent-based assays screen compounds on the basis of their ability to either open or close an ion channel thereby changing the concentration of specific fluorescent dyes across a membrane. In the case of the tracer based assay, the changes in concentration of the tracer within and outside the cell are measured by radioactivity measurement or gas absorption spectrometry.

Depending on the choice of the skilled artisan, the present assay method may be designed to function as a series of measurements, each of which is designed to determine whether the drug candidate compound is indeed acting on the polypeptide to thereby induce the differentiation of undifferentiated cells into osteoblasts. For example, an assay designed to determine the binding affinity of a compound to the polypeptide, or fragment thereof, may be necessary, but not sufficient, to ascertain whether the test compound would be useful for increasing mean bone density when administered to a subject. Nonetheless, such binding information would be useful in identifying a set of test compounds for use in an assay that would measure a different property, further down the biochemical pathway, such as bone mineralization, assayed by measuring the amount of deposited calcium. Such second assay may be designed to confirm that the test compound, having binding affinity for the polypeptide, actually induces the differentiation of undifferentiated cells into osteoblasts. Suitable controls should always be in place to insure against false positive readings.

The order of taking these measurements is not believed to be critical to the practice of the present invention, which may be practiced in any order. For example, one may first perform a screening assay of a set of compounds for which no information is known respecting the compounds' binding affinity for the polypeptide. Alternatively, one may screen a set of compounds identified as having binding affinity for a polypeptide domain, or a class of compounds identified as being an inhibitor of the polypeptide. However, for the present assay to be meaningful to the ultimate use of the drug candidate compounds, a measurement of bone alkaline phosphatase levels or bone mineralization is necessary. Validation studies including controls, and measurements of binding affinity to the polypeptides of the invention are nonetheless useful in identifying a compound useful in any therapeutic or diagnostic application.

The binding affinity of the compound with the polypeptide TARGET can be measured by methods known in the art, such as using surface plasmon resonance biosensors (Biacore), by saturation binding analysis with a labeled compound (e.g. Scatchard and Lindmo analysis), by differential UV spectrophotometer, fluorescence polarization assay, Fluorometric Imaging, Plate Reader (FLIPR®) system, Fluorescence resonance energy transfer, and Bioluminescence resonance energy transfer. The binding affinity of compounds can also be expressed in dissociation constant (Kd) or as IC50 or EC50. The 1050 represents the concentration of a compound that is required for 50% inhibition of binding of another ligand to the polypeptide. The EC50 represents the concentration required for obtaining 50% of the maximum effect in any assay that measures TARGET function. The dissociation constant, Kd, is a measure of how well a ligand binds to the polypeptide, it is equivalent to the ligand concentration required to saturate exactly half of the binding-sites on the polypeptide. Compounds with a high affinity binding have low Kd, IC50 and EC50 values, i.e. in the range of 100 nM to 1 pM; a moderate to low affinity binding relates to a high Kd, IC50 and EC50 values, i.e. in the micromolar range.

The present assay method may also be practiced in a cellular assay, A host cell expressing TARGET can be a cell with endogenous expression or a cell over-expressing the TARGET e.g. by transduction. When the endogenous expression of the polypeptide is not sufficient to determine a baseline that can easily be measured, one may use host cells that over-express TARGET. Over-expression has the advantage that the level of the TARGET substrate end products is higher than the activity level by endogenous expression. Accordingly, measuring such levels using presently available techniques is easier. In such cellular assay, the biological activity of TARGET may be measured by following the production of bone alkaline phosphatase (BAP) or bone mineralization.

The present invention further relates to a method for identifying a compound that induces differentiation of undifferentiated mammalian cells into osteoblasts, comprising:

-   -   (a) contacting a compound with a polypeptide comprising an amino         acid sequence selected from the group consisting of SEQ ID NO:         377-599, 601-606, 867-1119, 1123-1133;     -   (b) determining the binding affinity of the compound to the         polypeptide;     -   (c) contacting a population of mammalian cells expressing said         polypeptide with the compound that exhibits a binding affinity         of at least 10 micromolar; and     -   (d) identifying the compound that induces the differentiation of         said undifferentiated cells.

For high-throughput purposes, libraries of compounds may be used such as antibody fragment libraries, peptide phage display libraries, peptide libraries (e.g. LOPAP™, Sigma Aldrich), lipid libraries (BioMol), synthetic compound libraries (e.g. LOPAC™, Sigma Aldrich) or natural compound libraries (Specs, TimTec).

Preferred drug candidate compounds are low molecular weight compounds. Low molecular weight compounds, i.e. with a molecular weight of 500 Dalton or less, are likely to have good absorption and permeation in biological systems and are consequently more likely to be successful drug candidates than compounds with a molecular weight above 500 Dalton (Lipinski et al. (1997)). Peptides comprise another preferred class of drug candidate compounds. Peptides may be excellent drug candidates and there are multiple examples of commercially valuable peptides such as fertility hormones and platelet aggregation inhibitors. Natural compounds are another preferred class of drug candidate compound. Such compounds are found in and extracted from natural sources, and which may thereafter be synthesized. The lipids are another preferred class of drug candidate compound.

Another preferred class of drug candidate compounds is an antibody. The present invention also provides antibodies directed against a TARGET. These antibodies may be endogenously produced to bind to the TARGET within the cell, or added to the tissue to bind to TARGET polypeptide present outside the cell. These antibodies may be monoclonal antibodies or polyclonal antibodies. The present invention includes chimeric, single chain, and humanized antibodies, as well as FAb fragments and the products of a FAb expression library, and Fv fragments and the products of an Fv expression library.

In certain embodiments, polyclonal antibodies may be used in the practice of the invention. The skilled artisan knows methods of preparing polyclonal antibodies. Polyclonal antibodies can be raised in a mammal, for example, by one or more injections of an immunizing agent and, if desired, an adjuvant. Typically, the immunizing agent and/or adjuvant will be injected in the mammal by multiple subcutaneous or intraperitoneal injections. Antibodies may also be generated against the intact TARGET protein or polypeptide, or against a fragment, derivatives including conjugates, or other epitope of the TARGET protein or polypeptide, such as the TARGET embedded in a cellular membrane, or a library of antibody variable regions, such as a phage display library.

It may be useful to conjugate the immunizing agent to a protein known to be immunogenic in the mammal being immunized. Examples of such immunogenic proteins include but are not limited to keyhole limpet hemocyanin, serum albumin, bovine thyroglobulin, and soybean trypsin inhibitor. Examples of adjuvants that may be employed include Freund's complete adjuvant and MPL-TDM adjuvant (monophosphoryl Lipid A, synthetic trehalose dicorynomycolate). One skilled in the art without undue experimentation may select the immunization protocol.

In some embodiments, the antibodies may be monoclonal antibodies. Monoclonal antibodies may be prepared using methods known in the art. The monoclonal antibodies of the present invention may be “humanized” to prevent the host from mounting an immune response to the antibodies. A “humanized antibody” is one in which the complementarity determining regions (CDRs) and/or other portions of the light and/or heavy variable domain framework are derived from a non-human immunoglobulin, but the remaining portions of the molecule are derived from one or more human immunoglobulins. Humanized antibodies also include antibodies characterized by a humanized heavy chain associated with a donor or acceptor unmodified light chain or a chimeric light chain, or vice versa. The humanization of antibodies may be accomplished by methods known in the art (see, e.g. Mark and Padlan, (1994) “Chapter 4. Humanization of Monoclonal Antibodies”, The Handbook of Experimental Pharmacology Vol. 113, Springer-Verlag, New York). Transgenic animals may be used to express humanized antibodies.

Human antibodies can also be produced using various techniques known in the art, including phage display libraries (Hoogenboom and Winter, (1991) J. Mol. Biol. 227:381-8; Marks et al. (1991). J. Mol. Biol. 222:581-97). The techniques of Cole, et al. and Boerner, et al. are also available for the preparation of human monoclonal antibodies (Cole, et al. (1985) Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, p. 77; Boerner, et al (1991). J. Immunol., 147(1):86-95).

Techniques known in the art for the production of single chain antibodies can be adapted to produce single chain antibodies to the TARGET polypeptides and proteins of the present invention. The antibodies may be monovalent antibodies. Methods for preparing monovalent antibodies are well known in the art. For example, one method involves recombinant expression of immunoglobulin light chain and modified heavy chain. The heavy chain is truncated generally at any point in the Fc region so as to prevent heavy chain cross-linking Alternatively; the relevant cysteine residues are substituted with another amino acid residue or are deleted so as to prevent cross-linking.

Bispecific antibodies are monoclonal, preferably human or humanized, antibodies that have binding specificities for at least two different antigens and preferably for a cell-surface protein or receptor or receptor subunit. In the present case, one of the binding specificities is for one domain of the TARGET; the other one is for another domain of the same or different TARGET.

Methods for making bispecific antibodies are known in the art. Traditionally, the recombinant production of bispecific antibodies is based on the co-expression of two immunoglobulin heavy-chain/light-chain pairs, where the two heavy chains have different specificities (Milstein and Cuello, (1983) Nature 305:537-9). Because of the random assortment of immunoglobulin heavy and light chains, these hybridomas (quadromas) produce a potential mixture of ten different antibody molecules, of which only one has the correct bispecific structure. Affinity chromatography steps usually accomplish the purification of the correct molecule. Similar procedures are disclosed in Trauneeker, et al. (1991) EMBO J. 10:3655-9.

According to another preferred embodiment, the assay method uses a drug candidate compound identified as having a binding affinity for a TARGET, and/or has already been identified as having down-regulating activity such as antagonist activity vis-à-vis one or more TARGET.

The present invention further relates to a method for inducing differentiation of undifferentiated mammalian cells into osteoblasts comprising contacting said cells with an expression inhibitory agent comprising a polynucleotide sequence that complements at least about 17 nucleotides of the polyribonucleotide comprising a nucleotide sequence selected from the group consisting of SEQ ID NO: 335-376, 600, 607-866, 1120-1122.

Another aspect of the present invention relates to a method for inducing the differentiation of undifferentiated mammalian cells into osteoblasts, comprising by contacting said cell with an expression-inhibiting agent that inhibits the translation in the cell of a polyribonucleotide encoding a TARGET polypeptide. A particular embodiment relates to a composition comprising a polynucleotide including at least one antisense strand that functions to pair the agent with the TARGET mRNA, and thereby down-regulate or block the expression of TARGET polypeptide. The inhibitory agent preferably comprises antisense polynucleotide, a ribozyme, and a small interfering RNA (siRNA), wherein said agent comprises a nucleic acid sequence complementary to, or engineered from, a naturally-occurring polynucleotide sequence encoding a portion of a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 377-418, 601, 867-1119, 1123-1133. In a preferred embodiment the expression-inhibiting agent is complementary to a polynucleotide sequence selected from the group consisting of SEQ ID NO: 335-376, 600, 607-866, 1120-1122. In another preferred embodiment the expression-inhibiting agent is complementary to a polynucleotide sequence selected from the group consisting of SEQ ID NO: 1-220, 247-333.

An embodiment of the present invention relates to a method wherein the expression-inhibiting agent is selected from the group consisting of antisense RNA, antisense oligodeoxynucleotide (ODN), a ribozyme that cleaves the polyribonucleotide coding for SEQ ID NO: 377-418, 601, 867-1119, 1123-1133, a small interfering RNA (siRNA, preferably shRNA,) that is sufficiently complementary to a portion of the polyribonucleotide coding for SEQ ID NO: 377-418, 601, 867-1119, 1123-1133, such that the siRNA, preferably shRNA, interferes with the translation of the TARGET polyribonucleotide to the TARGET polypeptide. Preferably the expression-inhibiting agent is an antisense RNA, ribozyme, antisense oligodeoxynucleotide, or siRNA, preferably shRNA, complementary to a nucleotide sequence selected from the group consisting of SEQ ID NO: 335-376, 600, 607-866, 1120-1122.

A special embodiment of the present invention relates to a method wherein the expression-inhibiting agent is a nucleic acid expressing the antisense RNA, antisense oligodeoxynucleotide (ODN), a ribozyme that cleaves the polyribonucleotide coding for SEQ ID NO: 377-418, 601, a small interfering RNA (siRNA, preferably shRNA,) that is sufficiently complementary to a portion of the polyribonucleotide corresponding to SEQ ID NO: 377-418, 601, such that the siRNA, preferably shRNA, interferes with the translation of the TARGET polyribonucleotide to the TARGET polypeptide. Preferably the nucleotide sequence is complementary to a polynucleotide selected from the group consisting of SEQ ID NO: 335-376, 600. In another preferred embodiment nucleotide sequence is complementary to a polynucleotide selected from the group consisting of SEQ ID NO: 1, 6, 8, 9, 10, 16, 23, 26, 42, 54, 63, 93, 96, 98, 111, 127, 137, 141, 142, 147, 148, 156, 158, 159, 164, 180, 188, 189, 214.

The down regulation of gene expression using antisense nucleic acids can be achieved at the translational or transcriptional level. Antisense nucleic acids of the invention are preferably nucleic acid fragments capable of specifically hybridizing with all or part of a nucleic acid encoding a TARGET polypeptide or the corresponding messenger RNA. In addition, antisense nucleic acids may be designed which decrease expression of the nucleic acid sequence capable of encoding a TARGET polypeptide by inhibiting splicing of its primary transcript. Any length of antisense sequence is suitable for practice of the invention so long as it is capable of down-regulating or blocking expression of a nucleic acid coding for a TARGET. Preferably, the antisense sequence is at least about 17 nucleotides in length. The preparation and use of antisense nucleic acids, DNA encoding antisense RNAs and the use of oligo and genetic antisense is known in the art.

One embodiment of expression-inhibitory agent is a nucleic acid that is antisense to a nucleic acid comprising SEQ ID NO: 335-376, 600, 607-866, 1120-1122. For example, an antisense nucleic acid (e.g. DNA) may be introduced into cells in vitro, or administered to a subject in vivo, as gene therapy to inhibit cellular expression of nucleic acids comprising SEQ ID NO: 335-376, 600, 607-866, 1120-1122. Antisense oligonucleotides preferably comprise a sequence containing from about 17 to about 100 nucleotides and more preferably the antisense oligonucleotides comprise from about 18 to about 30 nucleotides. Antisense nucleic acids may be prepared from about 10 to about 30 contiguous nucleotides complementary to a nucleic acid sequence selected from the sequences of SEQ ID NO: 335-376, 600, 607-866, 1120-1122.

The antisense nucleic acids are preferably oligonucleotides and may consist entirely of deoxyribo-nucleotides, modified deoxyribonucleotides, or some combination of both. The antisense nucleic acids can be synthetic oligonucleotides. The oligonucleotides may be chemically modified, if desired, to improve stability and/or selectivity. Since oligonucleotides are susceptible to degradation by intracellular nucleases, the modifications can include, for example, the use of a sulfur group to replace the free oxygen of the phosphodiester bond. This modification is called a phosphorothioate linkage. Phosphorothioate antisense oligonucleotides are water soluble, polyanionic, and resistant to endogenous nucleases. In addition, when a phosphorothioate antisense oligonucleotide hybridizes to its TARGET site, the RNA-DNA duplex activates the endogenous enzyme ribonuclease (RNase) H, which cleaves the mRNA component of the hybrid molecule.

In addition, antisense oligonucleotides with phosphoramidite and polyamide (peptide) linkages can be synthesized. These molecules should be very resistant to nuclease degradation. Furthermore, chemical groups can be added to the 2′ carbon of the sugar moiety and the 5 carbon (C-5) of pyrimidines to enhance stability and facilitate the binding of the antisense oligonucleotide to its TARGET site. Modifications may include 2′-deoxy, O-pentoxy, O-propoxy, O-methoxy, fluoro, methoxyethoxy phosphorothioates, modified bases, as well as other modifications known to those of skill in the art.

Another type of expression-inhibitory agent that reduces the levels of TARGETS is the ribozyme. Ribozymes are catalytic RNA molecules (RNA enzymes) that have separate catalytic and substrate binding domains. The substrate binding sequence combines by nucleotide complementarity and, possibly, non-hydrogen bond interactions with its TARGET sequence. The catalytic portion cleaves the TARGET RNA at a specific site. The substrate domain of a ribozyme can be engineered to direct it to a specified mRNA sequence. The ribozyme recognizes and then binds a TARGET mRNA through complementary base pairing. Once it is bound to the correct TARGET site, the ribozyme acts enzymatically to cut the TARGET mRNA. Cleavage of the mRNA by a ribozyme destroys its ability to direct synthesis of the corresponding polypeptide. Once the ribozyme has cleaved its TARGET sequence, it is released and can repeatedly bind and cleave at other mRNAs.

Ribozyme forms include a hammerhead motif, a hairpin motif, a hepatitis delta virus, group I intron or RNaseP RNA (in association with an RNA guide sequence) motif or Neurospora VS RNA motif Ribozymes possessing a hammerhead or hairpin structure are readily prepared since these catalytic RNA molecules can be expressed within cells from eukaryotic promoters (Chen, et al. (1992) Nucleic Acids Res. 20:4581-9). A ribozyme of the present invention can be expressed in eukaryotic cells from the appropriate DNA vector. If desired, the activity of the ribozyme may be augmented by its release from the primary transcript by a second ribozyme (Ventura, et al. (1993) Nucleic Acids Res. 21:3249-55).

Ribozymes may be chemically synthesized by combining an oligodeoxyribonucleotide with a ribozyme catalytic domain (20 nucleotides) flanked by sequences that hybridize to the TARGET mRNA after transcription. The oligodeoxyribonucleotide is amplified by using the substrate binding sequences as primers. The amplification product is cloned into a eukaryotic expression vector.

Ribozymes are expressed from transcription units inserted into DNA, RNA, or viral vectors. Transcription of the ribozyme sequences are driven from a promoter for eukaryotic RNA polymerase I (pol (I), RNA polymerase II (pol II), or RNA polymerase III (pol III). Transcripts from pol II or pol III promoters will be expressed at high levels in all cells; the levels of a given pol II promoter in a given cell type will depend on nearby gene regulatory sequences. Prokaryotic RNA polymerase promoters are also used, providing that the prokaryotic RNA polymerase enzyme is expressed in the appropriate cells (Gao and Huang, (1993) Nucleic Acids Res. 21:2867-72). It has been demonstrated that ribozymes expressed from these promoters can function in mammalian cells (Kashani-Sabet, et al. (1992) Antisense Res. Dev. 2:3-15).

A particularly preferred inhibitory agent is a small interfering RNA (siRNA, preferably shRNA). siRNA, preferably shRNA, mediate the post-transcriptional process of gene silencing by double stranded RNA (dsRNA) that is homologous in sequence to the silenced RNA. siRNA according to the present invention comprises a sense strand of 17-25 nucleotides complementary or homologous to a contiguous 17-25 nucleotide sequence selected from the group of sequences described in SEQ ID NO: 335-376, 600, 607-866, 1120-1122, preferably from the group of sequences described in SEQ ID No: 335-376, 600, and an antisense strand of 17-23 nucleotides complementary to the sense strand. Exemplary sequences are described as sequences complementary to SEQ ID NO: 1-220, 247-333. The most preferred siRNA comprises sense and anti-sense strands that are 100 percent complementary to each other and the TARGET polynucleotide sequence. Preferably the siRNA further comprises a loop region linking the sense and the antisense strand.

A self-complementing single stranded siRNA molecule polynucleotide according to the present invention comprises a sense portion and an antisense portion connected by a loop region linker. Preferably, the loop region sequence is 4-30 nucleotides long, more preferably 5-15 nucleotides long and most preferably 12 nucleotides long. In a most preferred embodiment the linker sequence is GTTTGCTATAAC (SEQ ID NO: 334). Self-complementary single stranded siRNAs form hairpin loops and are more stable than ordinary dsRNA. In addition, they are more easily produced from vectors.

Analogous to antisense RNA, the siRNA can be modified to confirm resistance to nucleolytic degradation, or to enhance activity, or to enhance cellular distribution, or to enhance cellular uptake, such modifications may consist of modified internucleoside linkages, modified nucleic acid bases, modified sugars and/or chemical linkage the siRNA to one or more moieties or conjugates. The nucleotide sequences are selected according to siRNA designing rules that give an improved reduction of the TARGET sequences compared to nucleotide sequences that do not comply with these siRNA designing rules (For a discussion of these rules and examples of the preparation of siRNA, WO2004094636, published Nov. 4, 2004, and UA20030198627, are hereby incorporated by reference).

The present invention also relates to compositions, and methods using said compositions, comprising a DNA expression vector capable of expressing a polynucleotide capable of inducing osteoblast differentiation and described hereinabove as an expression inhibition agent.

A special aspect of these compositions and methods relates to the down-regulation or blocking of the expression of a TARGET polypeptide by the induced expression of a polynucleotide encoding an intracellular binding protein that is capable of selectively interacting with the TARGET polypeptide. An intracellular binding protein includes any protein capable of selectively interacting, or binding, with the polypeptide in the cell in which it is expressed and neutralizing the function of the polypeptide. Preferably, the intracellular binding protein is a neutralizing antibody or a fragment of a neutralizing antibody having binding affinity to an epitope of the TARGET polypeptide of SEQ ID NO: 377-599, 601-606, 867-1119, 1123-1133, preferably SEQ ID NO: 377-599, 601-606. More preferably, the intracellular binding protein is a single chain antibody.

A special embodiment of this composition comprises the expression-inhibiting agent selected from the group consisting of antisense RNA, antisense oligodeoxynucleotide (ODN), a ribozyme that cleaves the polyribonucleotide coding for SEQ ID NO: 377-418, 601, 867-1119, 1123-1133, preferably SEQ ID NO: 377-418, 601, and a small interfering RNA (siRNA) that is sufficiently homologous to a portion of the polyribonucleotide coding for SEQ ID NO: 377-418, 601, 867-1119, 1123-1133, preferably SEQ ID NO: 377-418, 601, such that the siRNA interferes with the translation of the TARGET polyribonucleotide to the TARGET polypeptide.

The polynucleotide expressing the expression-inhibiting agent is preferably included within a vector. The polynucleic acid is operably linked to signals enabling expression of the nucleic acid sequence and is introduced into a cell utilizing, preferably, recombinant vector constructs, which will express the antisense nucleic acid once the vector is introduced into the cell. A variety of viral-based systems are available, including adenoviral, retroviral, adeno-associated viral, lentiviral, herpes simplex viral or a sendaviral vector systems, and all may be used to introduce and express polynucleotide sequence for the expression-inhibiting agents in TARGET cells.

Preferably, the viral vectors used in the methods of the present invention are replication defective. Such replication defective vectors will usually pack at least one region that is necessary for the replication of the virus in the infected cell. These regions can either be eliminated (in whole or in part), or be rendered non-functional by any technique known to a person skilled in the art. These techniques include the total removal, substitution, partial deletion or addition of one or more bases to an essential (for replication) region. Such techniques may be performed in vitro (on the isolated DNA) or in situ, using the techniques of genetic manipulation or by treatment with mutagenic agents. Preferably, the replication defective virus retains the sequences of its genome, which are necessary for encapsidating, the viral particles.

In a preferred embodiment, the viral element is derived from an adenovirus. Preferably, the vehicle includes an adenoviral vector packaged into an adenoviral capsid, or a functional part, derivative, and/or analogue thereof. Adenovirus biology is also comparatively well known on the molecular level. Many tools for adenoviral vectors have been and continue to be developed, thus making an adenoviral capsid a preferred vehicle for incorporating in a library of the invention. An adenovirus is capable of infecting a wide variety of cells. However, different adenoviral serotypes have different preferences for cells. To combine and widen the TARGET cell population that an adenoviral capsid of the invention can enter in a preferred embodiment, the vehicle includes adenoviral fiber proteins from at least two adenoviruses. Preferred adenoviral fiber protein sequences are serotype 17, 45 and 51. Techniques or construction and expression of these chimeric vectors are disclosed in US Published Patent Applications 20030180258 and 20040071660, hereby incorporated by reference.

In a preferred embodiment, the nucleic acid derived from an adenovirus includes the nucleic acid encoding an adenoviral late protein or a functional part, derivative, and/or analogue thereof. An adenoviral late protein, for instance an adenoviral fiber protein, may be favorably used to TARGET the vehicle to a certain cell or to induce enhanced delivery of the vehicle to the cell. Preferably, the nucleic acid derived from an adenovirus encodes for essentially all adenoviral late proteins, enabling the formation of entire adenoviral capsids or functional parts, analogues, and/or derivatives thereof. Preferably, the nucleic acid derived from an adenovirus includes the nucleic acid encoding adenovirus E2A or a functional part, derivative, and/or analogue thereof. Preferably, the nucleic acid derived from an adenovirus includes the nucleic acid encoding at least one E4-region protein or a functional part, derivative, and/or analogue thereof, which facilitates, at least in part, replication of an adenoviral derived nucleic acid in a cell. The adenoviral vectors used in the examples of this application are exemplary of the vectors useful in the present method of treatment invention.

Certain embodiments of the present invention use retroviral vector systems. Retroviruses are integrating viruses that infect dividing cells, and their construction is known in the art. Retroviral vectors can be constructed from different types of retrovirus, such as, MoMuLV (“murine Moloney leukemia virus” MSV (“murine Moloney sarcoma virus”), HaSV (“Harvey sarcoma virus”); SNV (“spleen necrosis virus”); RSV (“Rous sarcoma virus”) and Friend virus. Lentiviral vector systems may also be used in the practice of the present invention.

In other embodiments of the present invention, adeno-associated viruses (“AAV”) are utilized. The AAV viruses are DNA viruses of relatively small size that integrate, in a stable and site-specific manner, into the genome of the infected cells. They are able to infect a wide spectrum of cells without inducing any effects on cellular growth, morphology or differentiation, and they do not appear to be involved in human pathologies.

In the vector construction, the polynucleotide agents of the present invention may be linked to one or more regulatory regions. Selection of the appropriate regulatory region or regions is a routine matter, within the level of ordinary skill in the art. Regulatory regions include promoters, and may include enhancers, suppressors, etc.

Promoters that may be used in the expression vectors of the present invention include both constitutive promoters and regulated (inducible) promoters. The promoters may be prokaryotic or eukaryotic depending on the host. Among the prokaryotic (including bacteriophage) promoters useful for practice of this invention are lac, lacZ, T3, T7, lambda P_(r), P₁, and trp promoters. Among the eukaryotic (including viral) promoters useful for practice of this invention are ubiquitous promoters (e.g. HPRT, vimentin, actin, tubulin), intermediate filament promoters (e.g. desmin, neurofilaments, keratin, GFAP), therapeutic gene promoters (e.g. MDR type, CFTR, factor VIII), tissue-specific promoters (e.g. actin promoter in smooth muscle cells, or Flt and Flk promoters active in endothelial cells), including animal transcriptional control regions, which exhibit tissue specificity and have been utilized in transgenic animals: elastase I gene control region which is active in pancreatic acinar cells (Swift, et al. (1984) Cell 38:639-46; Ornitz, et al. (1986) Cold Spring Harbor Symp. Quant. Biol. 50:399-409; MacDonald, (1987) Hepatology 7:425-515); insulin gene control region which is active in pancreatic beta cells (Hanahan, (1985) Nature 315:115-22), immunoglobulin gene control region which is active in lymphoid cells (Grosschedl, et al. (1984) Cell 38:647-58; Adames, et al. (1985) Nature 318:533-8; Alexander, et al. (1987) Mol. Cell. Biol. 7:1436-44), mouse mammary tumor virus control region which is active in testicular, breast, lymphoid and mast cells (Leder, et al. (1986) Cell 45:485-95), albumin gene control region which is active in liver (Pinkert, et al. (1987) Genes and Devel. 1:268-76), alpha-fetoprotein gene control region which is active in liver (Krumlauf, et al. (1985) Mol. Cell. Biol., 5:1639-48; Hammer, et al. (1987) Science 235:53-8), alpha 1-antitrypsin gene control region which is active in the liver (Kelsey, et al. (1987) Genes and Devel., 1: 161-71), beta-globin gene control region which is active in myeloid cells (Mogram, et al. (1985) Nature 315:338-40; Kollias, et al. (1986) Cell 46:89-94), myelin basic protein gene control region which is active in oligodendrocyte cells in the brain (Readhead, et al. (1987) Cell 48:703-12), myosin light chain-2 gene control region which is active in skeletal muscle (Sani, (1985) Nature 314.283-6), and gonadotropic releasing hormone gene control region which is active in the hypothalamus (Mason, et al. (1986) Science 234:1372-8).

Other promoters which may be used in the practice of the invention include promoters which are preferentially activated in dividing cells, promoters which respond to a stimulus (e.g. steroid hormone receptor, retinoic acid receptor), tetracycline-regulated transcriptional modulators, cytomegalovirus immediate-early, retroviral LTR, metallothionein, SV-40, E1a, and MLP promoters.

Additional vector systems include the non-viral systems that facilitate introduction of polynucleotide agents into a patient. For example, a DNA vector encoding a desired sequence can be introduced in vivo by lipofection. Synthetic cationic lipids designed to limit the difficulties encountered with liposome-mediated transfection can be used to prepare liposomes for in vivo transfection of a gene encoding a marker (Felgner, et. al. (1987) Proc. Natl. Acad. Sci. USA 84:7413-7); see Mackey, et al. (1988) Proc. Natl. Acad. Sci. USA 85:8027-31; Ulmer, et al. (1993) Science 259:1745-8). The use of cationic lipids may promote encapsulation of negatively charged nucleic acids, and also promote fusion with negatively charged cell membranes (Felgner and Ringold, (1989) Nature 337:387-8). Particularly useful lipid compounds and compositions for transfer of nucleic acids are described in International Patent Publications WO 95/18863 and WO 96/17823, and in U.S. Pat. No. 5,459,127. The use of lipofection to introduce exogenous genes into the specific organs in vivo has certain practical advantages and directing transfection to particular cell types would be particularly advantageous in a tissue with cellular heterogeneity, for example, pancreas, liver, kidney, and the brain. Lipids may be chemically coupled to other molecules for the purpose of targeting. Targeted peptides, e.g., hormones or neurotransmitters, and proteins for example, antibodies, or non-peptide molecules could be coupled to liposomes chemically. Other molecules are also useful for facilitating transfection of a nucleic acid in vivo, for example, a cationic oligopeptide (e.g., International Patent Publication WO 95/21931), peptides derived from DNA binding proteins (e.g., International Patent Publication WO 96/25508), or a cationic polymer (e.g., International Patent Publication WO 95/21931).

It is also possible to introduce a DNA vector in vivo as a naked DNA plasmid (see U.S. Pat. Nos. 5,693,622, 5,589,466 and 5,580,859). Naked DNA vectors for therapeutic purposes can be introduced into the desired host cells by methods known in the art, e.g., transfection, electroporation, microinjection, transduction, cell fusion, DEAE dextran, calcium phosphate precipitation, use of a gene gun, or use of a DNA vector transporter (see, e.g., Wilson, et al. (1992) J. Biol. Chem. 267:963-7; Wu and Wu, (1988) J. Biol. Chem. 263:14621-4; Hartmut, et al. Canadian Patent Application No. 2,012,311, filed Mar. 15, 1990; Williams, et al (1991). Proc. Natl. Acad. Sci. USA 88:2726-30). Receptor-mediated DNA delivery approaches can also be used (Curiel, et al. (1992) Hum. Gene Ther. 3:147-54; Wu and Wu, (1987) J. Biol. Chem. 262:4429-32).

The present invention also provides biologically compatible, bone formation-enhancing compositions comprising an effective amount of one or more compounds identified as TARGET inhibitors, and/or the expression-inhibiting agents as described hereinabove.

A biologically compatible composition is a composition, that may be solid, liquid, gel, or other form, in which the compound, polynucleotide, vector, and antibody of the invention is maintained in an active form, e.g., in a form able to effect a biological activity. For example, a compound of the invention would have inverse agonist or antagonist activity on the TARGET; a nucleic acid would be able to replicate, translate a message, or hybridize to a complementary mRNA of a TARGET; a vector would be able to transfect a TARGET cell and expression the antisense, antibody, ribozyme or siRNA as described hereinabove; an antibody would bind a TARGET polypeptide domain.

A preferred biologically compatible composition is an aqueous solution that is buffered using, e.g., Tris, phosphate, or HEPES buffer, containing salt ions. Usually the concentration of salt ions will be similar to physiological levels. Biologically compatible solutions may include stabilizing agents and preservatives. In a more preferred embodiment, the biocompatible composition is a pharmaceutically acceptable composition. Such compositions can be formulated for administration by topical, oral, parenteral, intranasal, subcutaneous, and intraocular, routes. Parenteral administration is meant to include intravenous injection, intramuscular injection, intraarterial injection or infusion techniques. The composition may be administered parenterally in dosage unit formulations containing standard, well-known non-toxic physiologically acceptable carriers, adjuvants and vehicles as desired.

A particularly preferred embodiment of the present composition invention is a bone formation-enhancing pharmaceutical composition comprising a therapeutically effective amount of an expression-inhibiting agent as described hereinabove, in admixture with a pharmaceutically acceptable carrier. Another preferred embodiment is a pharmaceutical composition for the treatment or prevention of a condition a systemic or local decrease in mean bone density, or a susceptibility to the condition, comprising an effective bone formation-enhancing amount of a TARGET antagonist or inverse agonist, its pharmaceutically acceptable salts, hydrates, solvates, or prodrugs thereof in admixture with a pharmaceutically acceptable carrier. Pharmaceutical compositions for oral administration can be formulated using pharmaceutically acceptable carriers well known in the art in dosages suitable for oral administration. Such carriers enable the pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions, and the like, for ingestion by the patient. Pharmaceutical compositions for oral use can be prepared by combining active compounds with solid excipient, optionally grinding a resulting mixture, and processing the mixture of granules, after adding suitable auxiliaries, if desired, to obtain tablets or dragee cores. Suitable excipients are carbohydrate or protein fillers, such as sugars, including lactose, sucrose, mannitol, or sorbitol; starch from corn, wheat, rice, potato, or other plants; cellulose, such as methyl cellulose, hydroxypropylmethyl-cellulose, or sodium carboxymethyl-cellulose; gums including arabic and tragacanth; and proteins such as gelatin and collagen. If desired, disintegrating or solubilizing agents may be added, such as the cross-linked polyvinyl pyrrolidone, agar, alginic acid, or a salt thereof, such as sodium alginate. Dragee cores may be used in conjunction with suitable coatings, such as concentrated sugar solutions, which may also contain gum arabic, talc, polyvinyl-pyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures. Dyestuffs or pigments may be added to the tablets or dragee coatings for product identification or to characterize the quantity of active compound, i.e., dosage.

Pharmaceutical preparations that can be used orally include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a coating, such as glycerol or sorbitol. Push-fit capsules can contain active ingredients mixed with filler or binders, such as lactose or starches, lubricants, such as talc or magnesium stearate, and, optionally, stabilizers. In soft capsules, the active compounds may be dissolved or suspended in suitable liquids, such as fatty oils, liquid, or liquid polyethylene glycol with or without stabilizers.

Preferred sterile injectable preparations can be a solution or suspension in a non-toxic parenterally acceptable solvent or diluent. Examples of pharmaceutically acceptable carriers are saline, buffered saline, isotonic saline (e.g. monosodium or disodium phosphate, sodium, potassium; calcium or magnesium chloride, or mixtures of such salts), Ringer's solution, dextrose, water, sterile water, glycerol, ethanol, and combinations thereof 1,3-butanediol and sterile fixed oils are conveniently employed as solvents or suspending media. Any bland fixed oil can be employed including synthetic mono- or di-glycerides. Fatty acids such as oleic acid also find use in the preparation of injectables.

The composition medium can also be a hydrogel, which is prepared from any biocompatible or non-cytotoxic homo- or hetero-polymer, such as a hydrophilic polyacrylic acid polymer that can act as a drug absorbing sponge. Certain of them, such as, in particular, those obtained from ethylene and/or propylene oxide are commercially available. A hydrogel can be deposited directly onto the surface of the tissue to be treated, for example during surgical intervention.

Embodiments of pharmaceutical compositions of the present invention comprise a replication defective recombinant viral vector encoding the polynucleotide inhibitory agent of the present invention and a transfection enhancer, such as poloxamer. An example of a poloxamer is Poloxamer 407, which is commercially available (BASF, Parsippany, N.J.) and is a non-toxic, biocompatible polyol. A poloxamer impregnated with recombinant viruses may be deposited directly on the surface of the tissue to be treated, for example during a surgical intervention. Poloxamer possesses essentially the same advantages as hydrogel while having a lower viscosity.

The active expression-inhibiting agents may also be entrapped in microcapsules prepared, for example, by interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsules and poly-(methylmethacylate) microcapsules, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules) or in macroemulsions. Such techniques are disclosed in Remington's Pharmaceutical Sciences (1980) 16th edition, Osol, A. Ed.

Sustained-release preparations may be prepared. Suitable examples of sustained-release preparations include semi-permeable matrices of solid hydrophobic polymers containing the antibody, which matrices are in the form of shaped articles, e.g. films, or microcapsules. Examples of sustained-release matrices include polyesters, hydrogels (for example, poly(2-hydroxyethyl-methacrylate), or poly(vinylalcohol)), polylactides (U.S. Pat. No. 3,773,919), copolymers of L-glutamic acid and gamma-ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradable lactic acid-glycolic acid copolymers such as the LUPRON DEPOT™. (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate), and poly-D-(−)-3-hydroxybutyric acid. While polymers such as ethylene-vinyl acetate and lactic acid-glycolic acid enable release of molecules for over 100 days, certain hydrogels release proteins for shorter time periods. When encapsulated antibodies remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37° C., resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for stabilization depending on the mechanism involved. For example, if the aggregation mechanism is discovered to be intermolecular S—S bond formation through thio-disulfide interchange, stabilization may be achieved by modifying sulfhydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions.

As defined above, therapeutically effective dose means that amount of protein, polynucleotide, peptide, or its antibodies, agonists or antagonists, which ameliorate the symptoms or condition. Therapeutic efficacy and toxicity of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., ED50 (the dose therapeutically effective in 50% of the population) and LD50 (the dose lethal to 50% of the population). The dose ratio of toxic to therapeutic effects is the therapeutic index, and it can be expressed as the ratio, LD50/ED50. Pharmaceutical compositions that exhibit large therapeutic indices are preferred. The data obtained from cell culture assays and animal studies is used in formulating a range of dosage for human use. The dosage of such compounds lies preferably within a range of circulating concentrations that include the ED50 with little or no toxicity. The dosage varies within this range depending upon the dosage form employed, sensitivity of the patient, and the route of administration.

For any compound, the therapeutically effective dose can be estimated initially either in cell culture assays or in animal models, usually mice, rabbits, dogs, or pigs. The animal model is also used to achieve a desirable concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans. The exact dosage is chosen by the individual physician in view of the patient to be treated. Dosage and administration are adjusted to provide sufficient levels of the active moiety or to maintain the desired effect. Additional factors which may be taken into account include the severity of the disease state, age, weight and gender of the patient; diet, desired duration of treatment, method of administration, time and frequency of administration, drug combination(s), reaction sensitivities, and tolerance/response to therapy. Long acting pharmaceutical compositions might be administered every 3 to 4 days, every week, or once every two weeks depending on half-life and clearance rate of the particular formulation.

The pharmaceutical compositions according to this invention may be administered to a subject by a variety of methods. They may be added directly to TARGET tissues, complexed with cationic lipids, packaged within liposomes, or delivered to TARGET cells by other methods known in the art. Localized administration to the desired tissues may be done by direct injection, transdermal absorption, catheter, infusion pump or stent. The DNA, DNA/vehicle complexes, or the recombinant virus particles are locally administered to the site of treatment. Alternative routes of delivery include, but are not limited to, intravenous injection, intramuscular injection, subcutaneous injection, aerosol inhalation, oral (tablet or pill form), topical, systemic, ocular, intraperitoneal and/or intrathecal delivery. Examples of ribozyme delivery and administration are provided in Sullivan et al. WO 94/02595.

Antibodies according to the invention may be delivered as a bolus only, infused over time or both administered as a bolus and infused over time. Those skilled in the art may employ different formulations for polynucleotides than for proteins. Similarly, delivery of polynucleotides or polypeptides will be specific to particular cells, conditions, locations, etc.

As discussed hereinabove, recombinant viruses may be used to introduce DNA encoding polynucleotide agents useful in the present invention. Recombinant viruses according to the invention are generally formulated and administered in the form of doses of between about 10⁴ and about 10¹⁴ pfu. In the case of AAVs and adenoviruses, doses of from about 10⁶ to about 10¹¹ pfu are preferably used. The term pfu (“plaque-forming unit”) corresponds to the infective power of a suspension of virions and is determined by infecting an appropriate cell culture and measuring the number of plaques formed. The techniques for determining the pfu titre of a viral solution are well documented in the prior art.

The present invention also provides methods of enhancing bone formation, which comprise the administration to said subject a therapeutically effective amount of an expression-inhibiting agent of the invention. A further aspect of the invention relates to a method of treating or preventing a disease involving a systemic or local decrease in mean bone density, comprising administering to said subject a bone formation enhancing pharmaceutical composition as described herein.

The invention also relates to the use of an agent as described above for the preparation of a medicament for treating or preventing a disease involving a systemic or local descrease in mean bone density.

In a preferred embodiment of the present invention the disease is selected from the group consisting of osteoporosis, hypercalcemia of malignancy, multiple myelomatosis, hyperparathyroidism, and hyperthyroidism. A special embodiment of this invention is a method wherein the disease is osteoporosis.

Still another aspect of the invention relates to a method for diagnosing a pathological condition involving a systemic or local decrease in mean bone density or a susceptibility to the condition in a subject, comprising determining the amount of polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 377-418, 601, 867-1119, 1123-1133 in a biological sample, and comparing the amount with the amount of the polypeptide in a healthy subject, wherein an increase of the amount of polypeptide compared to the healthy subject is indicative of the presence of the pathological condition.

Preferably the pathological condition is selected from the group consisting of osteoporosis, hypercalcemia of malignancy, multiple myelomatosis, hyperparathyroidism, and hyperthyroidism. More preferably, the pathological condition is osteoporosis.

The polypeptides or the polynucleotides of the present invention employed in the methods described herein may be free in solution, affixed to a solid support, borne on a cell surface, or located intracellularly. To perform the methods it is feasible to immobilize either the polypeptide of the present invention or the compound to facilitate separation of complexes from uncomplexed forms of the polypeptide, as well as to accommodate automation of the assay. Interaction (e.g., binding of) of the polypeptide of the present invention with a compound can be accomplished in any vessel suitable for containing the reactants. Examples of such vessels include microtitre plates, test tubes, and microcentrifuge tubes. In one embodiment, a fusion protein can be provided which adds a domain that allows the polypeptide to be bound to a matrix. For example, the polypeptide of the present invention can be “His” tagged, and subsequently adsorbed onto Ni-NTA microtitre plates, or ProtA fusions with the polypeptides of the present invention can be adsorbed to IgG, which are then combined with the cell lysates (e.g., (35)^(S)-labelled) and the candidate compound, and the mixture incubated under conditions favorable for complex formation (e.g., at physiological conditions for salt and pH). Following incubation, the plates are washed to remove any unbound label, and the matrix is immobilized. The amount of radioactivity can be determined directly, or in the supernatant after dissociation of the complexes. Alternatively, the complexes can be dissociated from the matrix, separated by SDS-PAGE, and the level of the protein binding to the protein of the present invention quantitated from the gel using standard electrophoretic techniques.

Other techniques for immobilizing protein on matrices can also be used in the method of identifying compounds. For example, either the polypeptide of the present invention or the compound can be immobilized utilizing conjugation of biotin and streptavidin. Biotinylated protein molecules of the present invention can be prepared from biotin-NHS(N-hydroxy-succinimide) using techniques well known in the art (e.g., biotinylation kit, Pierce Chemicals, Rockford, Ill.), and immobilized in the wells of streptavidin-coated 96 well plates (Pierce Chemical). Alternatively, antibodies reactive with the polypeptides of the present invention but which do not interfere with binding of the polypeptide to the compound can be derivatized to the wells of the plate, and the polypeptide of the present invention can be trapped in the wells by antibody conjugation. As described above, preparations of a labeled candidate compound are incubated in the wells of the plate presenting the polypeptide of the present invention, and the amount of complex trapped in the well can be quantitated.

The polynucleotides of the invention, complementary to SEQ ID NO: 1-220, 247-333 increase osteoblast differentiation.

Accordingly, another embodiment of the present invention relates to a method for in vitro production of bone tissue, comprising the steps of contacting undifferentiated mammalian cells with a polynucleotide sequence comprising a sequence selected from the group consisting of sequences complementary to SEQ ID No: 335-376, 600, 607-866, 1120-1122, preferably selected from the group consisting of sequences complementary to SEQ ID NO: 1-220, 247-333 for a time sufficient to differentiate the undifferentiated cells into osteoblasts, thereby producing a continuous bone matrix.

In a preferred embodiment, the method comprises the steps of:

-   -   (a) applying undifferentiated mammalian cells on a substrate to         form a cellular substrate,     -   (b) introducing a polynucleotide comprising a nucleotide         sequence selected from the group consisting of sequences         complementary to SEQ ID No: 335-376, 600, 607-866, 1120-1122,         preferably selected from the group consisting of sequences         complementary to SEQ ID NO: 1-220, 247-333, for a time         sufficient to differentiate the undifferentiated cells into         osteoblasts, thereby producing a continuous bone matrix.

The invention thus provides a method for producing a substrate with a matrix grown thereon, which matrix may be used for the provision of load-bearing implants, including joint prostheses, such as artificial hip joints, knee joints and finger joints, and maxillofacial implants, such as dental implants. It can also be used for special surgery devices, such as spacers, or bone fillers, and for use in augmentation, obliteration or reconstitution of bone defects and damaged or lost bone. Bone formation can be optimized by variation in mineralization, both by inductive and by conductive processes.

The present invention also relates to a combination of a load-bearing implant (preferably coated with a matrix as described above) with a bone filler comprising a matrix as described.

The method of the invention is also very suitable in relation to revision surgery, i.e., when previous surgical devices require replacement.

Suitable undifferentiated cells are bone marrow cells, including haematopoietic cells and in particular stromal cells. The marrow cells, and especially the stromal cells are found to be very effective in the bone producing process when taken from their original environment.

The undifferentiated cells can be directly applied on the substrate or they can advantageously be multiplied in the absence of the substrate before being applied on the substrate. In the latter mode, the cells are still largely undifferentiated after multiplication and, for the purpose of the invention, they are still referred to as undifferentiated. Subsequently, the cells are allowed to differentiate. Differentiation can be induced or enhanced by the presence of suitable inductors, such as glucocorticoids, and dexamethasone. Suitable inductors of differentiation are the expression inhibitory agents of the present invention.

The use of undifferentiated cells provides several advantages. Firstly, their lower differentiation implies a higher proliferation rate and allows the eventual functionality to be better directed and controlled. Moreover, culturing these cells not only produces the required bone matrix containing organic and inorganic components, but also results in the presence, in the culture medium and in the matrix, of several factors which are essential for growth of the tissue and for adaptation to existing living tissue. Also, the culture medium can be a source of active factors such as growth factors, to be used in connection with the implanting process. Furthermore, such undifferentiated cells are often available in large quantities and more conveniently than e.g., mature bone cells, and exhibit a lower morbidity during recovery. Moreover, the undifferentiated cells can be obtained from the patient for whom the implant is intended. The bone resulting from these cells is autologous to the patient and thus no immune response will be induced. Matrices as thick as 100 μm can be produced as a result of the use of undifferentiated cells.

The substrate on which the undifferentiated cells can be applied and cultured can be a metal, such as titanium, cobalt/chromium alloy or stainless steel, a bioactive surface such as a calcium phosphate, polymer surfaces such as polyethylene, and the like. Although less preferred, siliceous material such as glass ceramics, can also be used as a substrate. Most preferred are metals, such as titanium, and calcium phosphates, even though calcium phosphate is not an indispensable component of the substrate. The substrate may be porous or non-porous. The cells can be applied at a rate of e.g., 10³-10⁶ per cm², in particular 10⁴-2×10⁵ cells per cm².

The culture medium to be used in the method according to the invention can be a commonly known culture medium such as MEM (minimum essential medium). Advantageously, the medium can be a conditioned medium. In this context, a conditioned medium is understood to be a medium wherein similar cells have previously been incubated, causing the medium to contain factors such as polypeptides, secreted by the cells which are important for cell growth and cell differentiation.

The cells are cultured for a time sufficient to produce a matrix layer, e.g., a matrix layer having a thickness of at least 0.5 μm, in particular from 1 up to 100 μm, more in particular of 10-50 μm. The cells may be contacted with the culture medium for e.g. 2-15 weeks, in particular 4-10 weeks.

The production of the matrix, when applied on a substrate, results in a continuous or quasi-continuous coating covering the substrate for at least 50%, in particular at least 80% of its surface area.

The present invention further relates to the osteoblast cells obtainable by the above method.

Still another aspect or the invention relates to a method for diagnosing a pathological condition involving cognitive impairment or a susceptibility to the condition in a subject, comprising determining the amount of polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 377-418, 601, 867-1119, 1123-1133 in a biological sample, and comparing the amount with the amount of the polypeptide in a healthy subject, wherein an increase of the amount of polypeptide compared to the healthy subject is indicative of the presence of the pathological condition.

The invention is further illustrated in the following figures and examples.

EXPERIMENTAL SECTION Example 1 Development of a High-Throughput Screening Method for the Detection of Endogenous Alkaline Phosphatase

Adenoviral Controls

Ad-BMP2: described in WO 03/018799

Ad-eGFP: Referred to as pIPspAdApt6-EGFP in WO 02070744

Ad-hCAR: hCAR cDNA is isolated using a PCR methodology. The hCAR cDNA is PCR amplified from a HeLa cell cDNA library (Quick clone, Clontech). A single fragment of 1119 by is obtained and digested with the HindIII and BamHI restriction enzymes. pIPspAdapt6 vector (WO99/64582) is digested with the same enzymes, gel-purified and used to ligate to the digested PCR hCAR fragment. AdC15 (Ad5/Ad35) and AdC20 (Ad5/Ad51) viruses are generated as described in WO02/24933

Ad5-luc_v13: Cloned by PCR and virus generated as described in WO 03020931

Ad5-M6PR_v1: Cloned using Sap1-sites into vector and virus generated as described in WO03/020931.

H9: Cloned using Sap1-sites into vector and virus generated as described in WO03/020931

H11: Cloned using Sap1-sites into vector and virus generated as described in WO03/020931

Principle of the Assay

Mesenchymal progenitor cells (MPCs) differentiate into osteoblasts in the presence of appropriate factors (e.g. BMP2). An assay to screen for such factors is developed by monitoring the activity of alkaline phosphatase (AP) enzyme, an early marker in the osteoblast differentiation program. MPCs are seeded in 384 well plates and simultaneously co-infected one day later with adenoviruses encoding the human coxsackie and adenovirus receptor (hCAR; Ad-hCAR) and individual siRNA adenoviruses (Ad-siRNA) from the SilenceSelect™ collection. AdC15-hCAR/AdC20-hCAR co-infection increases the AdC01-siRNA infection efficiency. Cellular AP activity is determined 13 days after the start of the infection (13 dpi). (FIG. 2 illustrates the principle of the assay).

Development of the Assay

MPCs are isolated from the bone marrow of healthy volunteers, obtained after informed consent (Cambrex/Biowhittaker, Verviers, Belgium).

In a series of experiments, carried out in 384 well plates, several parameters are optimized: cell seeding density, multiplicities of infection (MOI) of control viruses (Ad-BMP2 or Ad-eGFP), MOI of Ad-hCAR, duration of infection, toxicity, infection efficiency (using Ad-eGFP) and the day of readout.

Using Ad-BMP2 (BMP2 overexpression) as a positive control for assay development, the following protocol results in the highest dynamic range for the assay with the lowest standard deviation on the background signal:

MPCs are seeded on day 0 at 500 cells per well of a 384 well plate and co-infected the next day using a mix of Ad-hCAR (5 μl of an Ad-hCAR solution: mix total MOI=155.7) and 1 μl of Ad-control-virus (Ad-BMP2 or Ad-eGFP; corresponds to a theoretical MOI of 5000). On day 5, the medium containing the virus is removed and replaced by fresh medium containing no virus. Up-regulation of alkaline phosphatase is read at 13 dpi (days post infection): 15 μl 4-Methylumbelliferylphosphate (MUP, Sigma) is added to each well, the plates are incubated for 15 min at 37° C. and monitored for AP activity using a fluorescence plate reader (Fluostar, BMG).

After optimisation of the assay, a small pilot screen is run (103 different Ad-siRNA viruses) with the use of robotics (96/384 channel dispensor Tecan Freedom 200 equipped with TeMO96, TeMO384 and RoMa, Tecan A G, Switzerland). The TARGETS from this screen are collected and retested in the same assay. The two Ad-siRNAs that score strongest (H9=H24-010; H10=H24-011) are used to generate a control plate (knock-down (KD) control plate) containing Ad-siRNAs. The control plate, a 96 well plate containing 3 negative (N1, N2, N3) and 3 positive (P1, P2, P3) control viruses is depicted in FIG. 3. This “knock-down” control plate contains Ad-H9 (H24-010) and Ad-H10 (H24-011) as positive controls; Ad-eGFP (knock-in virus) as infection control; and Ad-eGFP-siRNA, Ad-M6PR-siRNA and Ad-Luc-siRNA (all 3 are knock-down viruses) as negative controls.

The control viruses are pipetted from 96 well KD control plates into 384 well plates using robotics. (The final lay-out of the 384 well plate is depicted in FIG. 4).

FIG. 5 shows the results of the automated screening procedure using the KD control plate. The mean and standard deviations of the KD negative controls (N1-N3) are used to calculate a cut-off for TARGET analysis, which is set at the mean for N1, N2, N3 (All negatives') plus 3 times the standard deviation for ‘All negatives’. The positive controls (P1 and P2), scored in more than 95% of the infected wells. The negative control viruses scored in less than 5% of the wells.

Example 2 Screening of 7980 Ad-siRNA Adenoviruses in the Osteogenesis Assay

The optimized protocol for screening the SilenceSelect library is the following: on day 0, MPC cells are seeded in black 384 well plates with clear bottom (Costar or Nunc) in 60 μl medium at a density of 500 cells per well. One day later, 1 μl Ad-siRNA virus from the SilenceSelect™ collection, stored in 384 well plates (estimated titer of 2.5×10⁹ viral particles per ml) and 5 μl of Ad-hCAR solution (total MOI=155), dispensed in 96 well V-bottom plates, is transferred with the aid of a 96/384 channel dispenser (Tecan Freedom 200 equipped with TeMO96, TeMO384 and RoMa, Tecan A G, Switzerland) from the wells of a 96 well plate containing the Ad-hCAR solution to each of the wells of the 384 well plates containing MPCs. The KD control plate is run under the same conditions as the aliquot plates from the SilenceSelect collection. All Ad-siRNA viruses are screened in duplicate, with each singular on a different MPC plate. Plates are then incubated at 37° C. Four days post infection the medium containing the adenoviruses is replaced by fresh medium free of virus. Thirteen days post infection, the AP activity readout is performed. A typical result of a 384 well screening plate is depicted in FIG. 6, in which the relative fluorescence units (RFU) are plotted for each of the data points of the 384 well plate on the Y-axis; while the numbers on the X-axis correspond to positions in the 384 well plate.

This duplicate screen is done twice, and all four data points are used for TARGET identification (see Example 3).

Example 3 Target Identification Using the AP Assay

The data obtained from measuring the AP activity in Examples 1 and 2 are analyzed as follows: the background is calculated by taking the mean of the data points from all the plates except the control plate. A cut-off value for TARGET identification is calculated by adding 3 times the standard deviation of all data points, excluding the control plate. Each data point is analyzed for scoring above or under the cut-off Only Ad-siRNAs inducing endogenous AP activity levels above the cut-off are of further interest. TARGETS are prioritized according to their scoring in single or duplicate, in one or both of the screens. Data are collected for 7980 Ad-siRNA virus constructs representing 4091 independent genes. An overview of the constructs is given in Table 1.

One of the identified hits has been shown to be a bone anabolic factor before and therefore validates the assay:

H24-034: SRC

Marzia et al. (2000) showed that bone formation was increased in Src null mice compared to wild-type mice. Most relevant to this work, osteoblasts isolated from Src null mice or osteoblasts isolated from wild-type mice but transfected with Src-antisense oligonucleotides showed increased AP activity in vitro.

8 genes identified in the screen were targeted by 2 Ad-siRNAs. These genes are AVPR1B, FLJ22955, IL1F8, PPIA, USP38, C9, LOC254378 and BRS3 (see Table 1).

The siRNA sequences of the present invention comprise sequences complementary to sequences corresponding to the identified KD TARGETS (SEQ ID NO: 1-220, 247-333). For the preferred TARGETS, the corresponding polynucleotides known in public databases (referred to as SEQ ID NO: 335-376, 600, 607-866, 1120-1122), their respective names and the polypeptides translated from those polynucleotides (referred to as SEQ ID NO: 377-418, 601, 867-1119, 1123-1133), are listed in Table 1.

Example 4 Quality Control of the Target Ad-siRNAs

The Ad-siRNA TARGETS are subjected to further analysis to establish their therapeutic application as bone anabolic factors. The Ad-siRNA is subjected to quality control analysis (this example). Other validation steps are the validation of the TARGETS at the mRNA level (Example 5), screening of the targets in osteogenesis assays such as the mineralization assay (Example 6), and development of additional Ad-siRNAs targeting the identified genes (Example 9). TARGETS that remain of interest after these validation assays are considered for drug discovery and assays are developed allowing the discovery and optimization of compounds that mimic the bone anabolic actions of the target Ad-siRNAs (Example 7). In addition, the anti-resorptive activities of the identified Ad-siRNAs are validated in osteoclast assays (Example 8).

Verifying the Identity of the siRNA Insert from the TARGET Ad-siRNAs

TARGET Ad-siRNAs are propagated using PERC6/E2A cells (see WO99/64582) seeded in a 96-well plate, followed by re-screening of these viruses at several MOI's in the primary assay (see Example 1) and by sequencing the siRNAs encoded by the TARGET Ad-siRNA viruses. This procedure is carried out as follows.

PERC6/E2A cells are seeded in 96-well plates at a density of 40,000 cells/well in 180 μl PERC6/E2A medium. Cells are then incubated overnight at 39° C. in a 10% CO₂ humidified incubator. One day later, cells are infected with 1 μl of crude cell lysate from SilenceSelect™ stocks containing TARGET Ad-siRNAs. Cells are further incubated at 34° C., 10% CO₂ until appearance of cytopathic effect (cpe, as revealed by the swelling and rounding up of the cells which typically occurs 7 days post infection). The supernatant is collected and the virus crude lysate is treated with proteinase K: 12 μl crude lysate is added to 4 μl Lysis buffer (1× Expand High Fidelity buffer with MgCl₂ (Roche Molecular Biochemicals, Cat. No 1332465) supplemented with 1 mg/ml proteinase K (Roche Molecular Biochemicals, Cat No 745 723) and 0.45% Tween-20 (Roche Molecular Biochemicals, Cat No 1335465) in sterile PCR tubes. These are incubated at 55° C. for 2 h followed by a 15 min inactivation step at 95° C. For the PCR reaction, 1 μl lysate is added to a PCR master mix composed of 5 μl 10× Expand High Fidelity buffer with MgCl₂, 0.5 μl of dNTP mix (10 mM for each dNTP), 1 μl of ‘Forward primer’ (10 mM stock, sequence: 5′ CCG TTT ACG TGG AGA CTC GCC, SEQ ID NO: 245) and 1 μl ‘Reverse Primer’ (10 mM stock, sequence: 5′ CCC CCA CCT TAT ATA TAT TCT TTC C, SEQ ID NO: 246), 0.2 μl of Expand High Fidelity DNA polymerase (3.5 U/μl, Roche Molecular Biochemicals) and 41.3 μl H₂O. PCR is performed in a PE Biosystems GeneAmp PCR system 9700 as follows: the PCR mixture (50 μl in total) is incubated at 95° C. for 5 min; each cycle runs at 95° C. for 15 sec, 55° C. for 30 sec, 68° C. for 4 min, and is repeated for 35 cycles. A final incubation at 68° C. is performed for 7 min. 5 μl of the PCR mixture is mixed with 2 μl of 6× gel loading buffer, loaded on a 0.8% agarose gel containing 0.5 μg/μl ethidium bromide to resolve the amplification products. The size of the amplified fragments is estimated from a standard DNA ladder loaded on the same gel. The expected size is ˜500 bp.

For sequencing analysis, the siRNA constructs expressed by the TARGET adenoviruses are amplified by PCR using primers complementary to vector sequences flanking the SapI site of the pIPspAdapt6-U6 plasmid. The sequences of the PCR fragments are determined and compared with the expected sequence.

For the KD TARGET sequences identified (Table 1), sequence analysis confirmed that the siRNA present in the TARGET Ad-siRNA had the expected sequence.

Multiple MOI Rescreen

The propagated TARGET Ad-siRNAs were rescreened at several MOIs in the AP assay (Example 1). The Ad-siRNAs had to score in duplo at least one MOI to pass this quality control step.

All TARGETS listed in Table 1 fulfilled this quality control step and thus:

a) showed the correct length of the PCR fragment

b) showed the correct sequence of the PCR fragment

c) induced AP activity in duplicate for at least 1 MOI.

Example 5 mRNA Validation Experiments for Identified Targets

A validation of the target Ad-siRNAs is carried out on RNA isolated from infected MPCs. First, the expression of the targets is analyzed in several isolates of primary human MPCs and osteoblasts (hOBs). Second, the knock-down of the target gene expression by the Ad-siRNA is verified at the mRNA level. Third, the upregulation of endogenous bone AP mRNA versus that of placental or intestinal AP mRNA is analyzed.

MPC and Osteoblast Expression Analysis for the Identified Targets Profiling

Expression levels of target genes are determined in 4 different isolates of MPCs and 2 different isolates of hOBs. The MPCs and hOBs (obtained from Cambrex/Biowhittaker, Verviers, Belgium) are seeded at 3000 resp. 5000 cells/cm² in T180 flasks and cultured until they reach 80% confluency. The cells are washed with ice-cold PBS and harvested by adding 1050 μl SV RNA Lysis Buffer to a T180 flask. Total RNA is prepared using the SV Total RNA isolation System (Promega, Cat # Z3100). The concentration of the total RNA is measured with the Ribogreen RNA Quantification kit (Molecular Probes, Leiden, The Netherlands, Cat No. R-11490). cDNA synthesis is performed using 40 ng total RNA per reaction using the TaqMan Universal PCR Master Mix, No AmpErase UNG, kit (Applied Biosystems, Warrington, UK, Part number 4324018). For each RT reaction a minus-RT reaction (negative control: no enzyme included in the reaction) is performed.

The real-time reverse transcriptase (rtRT)-PCR reaction is performed with gene specific primers on both cDNA and minus-RT samples, using the SYBR Green PCR Master Mix (Applied Biosystems, Warrington, UK, Part number 4309155). For the normalization of the expression levels, a RT-PCR reaction is performed on human-actin using the Human-actin kit (Applied Biosystems, Warrington, UK, Part number 4310881E). The following program is run on a real-time PCR apparatus (ABI PRISM 7000 Sequence Detection System): 10 min at 25° C., 30 min at 48° C., 5 min at 95° C. In FIGS. 7A and 8, relative expression levels for 10 genes are depicted for respectively MPC and hOB isolates. For the data in FIG. 7A, total RNA is extracted from 4 different MPC isolates and used to analyze expression levels of target genes identified through the target Ad-siRNAs. RtRT-PCR compatible primer sets (Table 4) are developed for 10 genes and compared to expression levels of -actin. Data are expressed as log(difference to -actin) (Y-axis). For the data presented in FIG. 8, total RNA is extracted from 2 different hOB isolates.

TABLE 4 SEQ ID Gene Primer Name Sequence NO. CALCRL CALCRL_Rev AGAGACCAAAAGACCCTGGAAGT 222 SRC SRC_For ACAGCGGCGGCTTCTACA 223 SRC SRC_Rev CATCGGCGTGTTTGGAGTAGT 224 PSMB3 PSMB3_For ATCCGGATCACCTGTTTGAAAC 225 PSMB3 PSMB3_Rev GTGGTGATTTTGTCCTTCTCGAT 226 HP43.8KD HP43.8KD_For CCATACACAGAGGGAAGCATACG 227 HP43.8KD HP43.8KD_Rev CAGTCTTGCTGTGATCTGGGAGTA 228 APEX APEX_For GCATAGGCGATGAGGAGCAT 229 APEX APEX_Rev GACCTCGGCCTGCATTAGG 230 GPR38 GPR38_For CATCGTCGCTCTGCAACTTTT 231 GPR38 GPR38_Rev CCGCTCTGTACTTCTTTGAAATGA 232 ROCK2 ROCK2_For CCTGGTGGAGACCTTGTAAACCT 233 ROCK2 ROCK2_Rev AGCAAGAACAACTTCAGCAGTGTAA 234 CXCR6 CXCR6_For GCCATGACCAGCTTTCACTACA 235 CXCR6 CXCR6_Rev GTTAAGGCAGGCCCTCAGGTA 236 OPN3 OPN3_For CTAACCGTGCTGGCCTATGAAC 237 OPN3 OPN3_Rev CAGGCCCAGGAAAAATTGATC 238 FUK FUK_For TTCGCGATCAGCCCCTTAC 239 FUK FUK_Rev ACTCACTGGCTGAGGAGGTCAT 240

Analysis of the Knock-Down of the Target Gene Expression by the Ad-siRNA is Verified at the mRNA Level.

To determine whether the target Ad-siRNAs result in knock-down of expression from the corresponding gene, total RNA is harvested from Ad-siRNA infected MPCs and gene expression is analyzed using gene-specific primers.

MPCs are seeded at 25,000 cells per well of a 24 well plate. After 24 hours the cells are infected with knock-down hit viruses or negative control viruses Ad-gPPARg and Ad-GL2.2 that knock down the expression of respectively PPAR (all four known splice variants) and luciferase, both of which are not related to osteogenesis. For Ad-siRNAs, cells are co-infected with Ad-hCAR and Ad-siRNA crude lysates (MOI Ad-hCAR: 750; 40, 10, 3.3 μL virus with average titer of 2.5×10E9 virus particles/ml). At 5 dpi the medium is refreshed and at 14 dpi the cell lysates are prepared. Cells are processed for mRNA analysis as described in the previous section. mRNA levels for a specific gene are normalized for -actin levels and compared to levels measured for the negative control Ad-siRNAs. An example of these kind of analyses is provided in FIG. 7B. Data are normalized for -actin expression levels and compared to endogenous gene expression for MPCs infected with negative control viruses (Y-axis: percent gene expression of endogenous gene; 100%=endogenous mRNA levels present in negative control sample).

Analysis of the Upregulation of Endogenous Bone AP mRNA Versus that of Placental or Intestinal AP mRNA.

BAP is the physiologically relevant AP involved in bone formation. In order to determine whether the measured AP activities are due to upregulation of BAP expression or of another AP gene product, mRNA levels for all AP genes are analysed for infected MPCs.

mRNA levels are determined as described in the previous sections. The difference is in the primer set used (see Table 5): one set detects BAP ALPL (human alkaline phosphatase liver/bone/kidney) mRNA expression. Another set detects the expression of the 3 other AP genes (ALPI (human alkaline phosphatase intestinal), ALPP (human alkaline phosphatase placental (PLAP)), and ALPPL2 (human alkaline phosphatase placental-like)). ALPI, ALPP and ALPPL2 are highly similar at the nucleotide level and can therefore be amplified using one primer pair.

The primer pairs are first validated on RNA isolated from MPCs infected with Ad-eGFP and Ad-BMP2. FIG. 7 illustrates the strong upregulation of BAP mRNA by Ad-BMP2 and the absence of upregulation of expression of any of the other AP genes. MPCs are infected in 24 well plate format using Ad-eGFP (negative control) or the osteogenic Ad-BMP2. Cells are harvested and RNA is prepared and subjected to rtRT-PCR using primer sets amplifying BAP mRNA or mRNA from the other 3 AP genes (PLAP/IAP). Ad-BMP2 strongly upregulates BAP mRNA levels but not the mRNA levels of the other 3 AP genes.

Both primer sets are then used to measure mRNA levels for all AP genes in RNA isolated from Ad-siRNA infected MPCs.

TABLE 5 SEQ ID Name Sequence NO: JDO-05F (PLAP) TTCCAGACCATTGGCTTGAGT 241 JDO-05bisR ACTCCCACTGACTTTCCTGCT 242 (PLAP/ALPI/ALPPL2) JDO-21F (BAP) CATGCTGAGTGACACAGACAAGAAG 243 JDO-21R (BAP) TGGTAGTTGTTGTGAGCATAGTCCA 244

Example 6 Mineralization

The process of osteogenesis consists of several successive events. During the initial phases of osteogenesis, bone alkaline phosphatase (BAP) becomes upregulated. It is however equally important to look at specific events occurring in later stages of osteogenesis such as mineralization. During differentiation, cells deposit (hydroxy)apatite (Ca²⁺-phosphate precipitate) on an extracellular matrix consisting mostly of collagen type I to form mineralized bone.

Assay Setup

In the bone cell mineralizing assay (BM assay), primary human MSCs are differentiated in vitro into mineralizing osteoblasts using BMP2 (recombinant or delivered by adenoviral transduction) as an osteogenic agent. Mineralization is then visualized by staining the MSCs with Alizarin Red, a dye with a high affinity for calcium (see FIG. 8).

Screening and TARGET Identification

The following optimized protocol is used for screening Ad-siRNA and Ad-cDNA TARGETS identified in the primary assay:

100,000 MPCs are seeded in each well of a 6 well plate in 2 ml MSC medium, containing 10% FCS. The next day, after incubation at 37° C., 10% CO₂ in a humidified incubator, cells are co-infected with AdC15-hCAR (final MOI of 750) and Ad-siRNA, Ad-cDNA or control viruses at a final MOI of 1250, 2500 and 5000. Cells are incubated at 37° C., 10% CO₂ in a humidified incubator for a further six days. Virus is removed and replaced by 2 ml fresh MSC medium, 10% FCS. Over the next 22 days, medium is refreshed 3 times in 2 weeks. Every other time, medium is refreshed half or completely. At 28 days after the start of the experiment, the conditioned medium is removed, cells are fixed using 10% paraformaldehyde and the monolayers stained with 1 mL of ˜1% Alizarin Red (Sigma, # A5533) in MilliQ water (pH adjusted to 4.2). Ad-eGFP, to assess infection efficiency, Ad-BMP2 as strong osteogenic inducer and Ad-H4-2 as a weak osteogenic factor are included in each experiment as negative and positive controls, respectively. Every experiment where Ad-H4-2 did not induce mineralization is entirely repeated.

The KD TARGET sequences of Ad-shRNAs that induced mineralization are presented in Table 6.

TABLE 6 KD TARGET SEQ Genbank TARGET Sequence ID TARGET DNA/RNA Id (5′→ 3′) NO. TARGET Gene Name Gene Symbol Accession H24-001 CAACTTGTACCTG 3 G protein-coupled GPR38 NM_001507 GGCAGC receptor 38 H24-004 CATGCTGTTTGAG 6 MAP kinase-interacting MKNK2 - NM_017572 - AGCATC serine/threonine kinase 2 MNK2 SK236 H24-006 GACGGTGTTAATG 8 casein kinase 1, gamma 1 CSNK1G1 - NM_022048 - ATAGCC CK1g1 SK647 H24-007 CTTCGGCACTCCT 9 myosin light chain kinase HSA247087 - AJ247087 - SK536 GAGTTC caMLCK H24-009 ACGCAAAGTGGC 11 tRNA IPT NM_017646 CAGGAGC isopentenyltransferase 1 H24-013 CAACCTGCTGGTG 15 opsin 3 (encephalopsin, OPN3 NM_014322 CTCGTC panopsin) H24-014 CTCTCTTAGATCT 16 granzyme K (serine GZMK NM_002104 GGAACC protease, granzyme 3; tryptase II) H24-015 AGCAGGAAGGCG 17 ubiquitin-specific protease AF073344 - AF073344 - GACATAC 3-ubiquitin specific USP3 NM_006537 protease 3 H24-018 TCAGGTAGTTGGT 20 coagulation factor XIII, F13A1 NM_000129 TCTGAC A1 polypeptide H24-019 CTGCGCCGAACA 21 proteasome (prosome, PSMB3 NM_002795 AATGTAC macropain) subunit, beta type, 3 H24-020 TGTGGCGACTTGT 22 ClpX caseinolytic CLPX NM_006660 GCACAC protease X homolog (E. coli) H24-021 TCTCTCAGTGTAG 23 hypothetical protein FLJ14906 NM_032859 AATGCC FLJ14906 H24-024 GTGTACTGGTACA 26 matrix metalloproteinase MMP23A - NM_004659 - AGGACC 23A-matrix MMP23B NM_006983 metalloproteinase 23B H24-026 TCTCTCATCAATA 28 APEX nuclease APEX NM_001641- CTGGTC (multifunctional DNA NM_080648- repair enzyme) NM_080649 H24-029 CTATGCCATCACC 31 LOC254378 LOC254378 XM_174812 TTCTGC H24-030 TGTGCCGAAGGAT 32 similar to a disintegrin and LOC137491 XM_070459 GTAAGC metalloprotease domain 25 (testase 2) H24-031 CCGGGACATAACT 33 similar to bile salt- LOC138529 XM_070951 AAATCC dependent lipase oncofetal isoform H24-032 AGCAGGCTATGG 34 complement component 9 C9 NM_001737 GATCAAC H24-033 CCACAAGGTTGCA 35 xylulokinase homolog XYLB NM_005108 GCATTC (H. influenzae) H24-035 GGGCTCAGCCAG 36 chaperone, ABC1 activity CABC1 - NM_020247 - GAGATTC of bc1 complex like (S. pombe) ADCK3 SK609 H24-036 CAGGTAGACATG 37 fyn-related kinase FRK NM_002031 GCGGCAC H24-038 GCACGATTTGGAG 39 unc-51-like kinase 1 (C. elegans) ULK1 NM_003565 GTCGCC H24-041 GGACTCTCAGTTC 42 phosphoinositide-3- PIK3C2B NM_002646 AGCATC kinase, class 2, beta polypeptide H24-049 GTACCTGCAGGTG 1 arginine vasopressin AVPR1B NM_000707 CTCAGC receptor 1B H24-054 GTACCTGCGGCAG 54 chemokine (C-C motif) CCR1 NM_001295 TTGTTC receptor 1 H24-062 TTCGGACACCCAC 62 retinal pigment RRH NM_006583 AAATGC epithelium-derived rhodopsin homolog H24-064 GTTGTCCTGTTCT 63 olfactory receptor, family OR1A2 NM_012352 GACGTC 1, subfamily A, member 2 H24-071 CACCTGCTTTCTC 70 KIAA1453 protein KIAA1453 NM_025090 AATGCC H24-073 AGCACCTCGCTGA 72 sentrin/SUMO-specific SENP3 NM_015670 CATTCC protease 3 H24-078 GCTTCTGGTGGAG 77 transglutaminase 3-like TGM3L XM_066181 AAGGAC H24-079 GTGTATGAAGTGG 78 similar to solute carrier LOC160662 XM_090422 TCCACC family 21 (organic anion transporter), member 8 H24-084 CAGTGCCAAGAA 83 neuron navigator 2 NAV2 NM_018162 GGAGCCC H24-092 ATGCAGGTCCATA 91 transient receptor potential TRPM6 NM_017662 TGTGAC cation channel, subfamily M, member 6 H24-093 CCTTTCTCTGAAC 92 ataxia telangiectasia and ATR NM_001184 ACGGAC Rad3 rdated H24-095 CAGGTTCTCCTCA 94 similar to TPA: G-protein LOC126788 XM_060177 AACGGC coupled receptor H24-097 ACATCCTGCTGTC 96 thousand and one amino TAO1 - PSK NM_004783 - AGAGCC acid protein kinase- NM_016151 prostate derived STE20- like kinase PSK H24-099 GTTCTCCAGTGCC 98 solute carrier family 16 SLC16A3 NM_004207 ATTGGC (monocarboxylic acid transporters), member 3 H24-104 AGTGCGCATCTTC 103 fibroblast growth factor FGF14 NM_004115 GGCCTC 14 H24-106 GCCCTGATGTCCA 105 NADPH-dependent FMN NR1 NM_014434 TCTTCC and FAD containing oxidoreductase H24-107 CATAGGGAAGGA 106 interleukin 1 family, IL1F8 NM_014438 CACTTGC member 8 (eta) H24-108 CCTGGATGTGAGA 107 interleukin 1 family, IL1F8 NM_014438 GAGAGC member 8 (eta) H24-109 AACTTGTACTATG 108 Ras association RASSF2 NM_014737 AAGGCC (RalGDS/AF-6) domain family 2 H24-110 GTATTCTGTACAC 109 androgen-regulated short- ARSDR1 NM_016026 CCTGGC chain dehydrogenase/reductase 1 H24-111 TTCTCGCAATGGC 110 peptidylprolyl isomerase PPIL1 NM_016059 CAATGC (cyclophilin)-like 1 H24-112 GAAGAACAGCAG 111 RAS, dexamethasone- RASD1 NM_016084 CCTGGAC induced 1 H24-113 TCAGGCGGATCTT 112 dicarbonyl/L-xylulose DCXR NM_016286 GACAGC reductase H24-117 TCTCTCCACACAA 116 chromosome 20 open C20orf121 NM_024331 ACCTTC reading frame 121 H24-119 GCGAATTCCACCA 118 solute carrier family 26, SLC26A8 NM_052961 GCATTC member 8 H24-120 TGTCCAGGACCTA 119 UDP glycosyltransferase 1 UGT1A1 NM_000463 TTGAGC family, polypeptide A1 H24-128 TGTGCGAGACCTC 127 HMT1 hnRNP HRMT1L3 NM_019854 GATTTC methyltransferase-like 3 (S. cerevisiae) H24-130 AGCATGAAAGAA 129 peroxisomal short-chain ENSG00000169066 - ENSG00000169066 - ACCCTGC alcohol dehydrogenase humNRDR NM_021004 H24-131 GAAGATCACCATT 130 similar to peptidylprolyl PPIA - NM_021130 - GCTGAC isomerase A (cyclophilin LOC127711 - XM_060625 - A)-similar to Peptidyl- LOC128430 - XM_066074 - prolyl cis-trans isomerase LOC138130 - XM_070771 - A (PPIase) (Rotamase) LOC165317 - XM_092514 - (Cyclophilin A) LOC257232 XM_172314 (Cyclosporin A-binding protein) (SP18) H24-133 TGCAGGCAAGCA 132 3-oxoacid CoA transferase 2 OXCT2 NM_022120 GACGGTC H24-136 CTTATTGTTCACA 135 similar to glyceraldehyde LOC170327 XM_093255 TTGGCC 3-phosphate dehydrogenase H24-138 TCAGGTGTCCCAT 137 interleukin-1 receptor- IRAK2 NM_001570- TCCAGC associated kinase 2 SK180 H24-141 GAGTCCAGCCTTC 140 cytochrome P450, HUMCYPIIF - J02906 - ATGCCC subfamily IIF, polypeptide 1 CYP2F1 NM_000774 H24-142 GTCCAGCTGAAG 141 glutamate receptor, GRIN2A NM_000833 AAGATCC ionotropic, N-methyl D- aspartate 2A H24-143 TTCGGCACTGAGG 142 hypothetical protein FLJ22955 NM_024819 TCTTGC FLJ22955 H24-145 CCTGCTCTTGAGC 144 tumor endothelial marker TEM5 NM_032777 AATAAC 5 precursor H24-146 TGTCCAGACCACA 145 similar to cytochrome LOC126538 XM_065152 TGGAGC P450, subfamily IVF, polypeptide 2; leukotriene B4 omega-hydroxyhse; leukotriene-B4 20- monooxygenase H24-148 GATTGTGGCCAAG 147 chloride intracellular CLIC6 XM_092804 AAGTAC channel 6 H24-149 CCTCATTATCACC 148 LOC167417 LOC167417 XM_094471 ATGCTC H24-150 CTGGTTATTGGCG 149 similar to 25- LOC165245 XM_103864 GGTATC hydroxyvitamin D-1 alpha hydroxylase, mitochondrial precursor (25-OHD-1 alpha- hydroxylase) (25- hydroxyvitamin D3 1- alpha-hydroxylase) (VD3 1A hydroxylase) (P450C1 alpha) (P450VD1-alpha) H24-154 GTTCAAGAAGCTG 153 opsin 1 (cone pigments), OPN1MW - NM_000513 - CGCCAC medium-wave-sensitive OPN1LW NM_020061 (color blindness, deutan)- opsin 1 (cone pigments), long-wave-sensitive (color blindness, protan) H24-156 GCAGTTCCAAGCT 155 opsin 1 (cone pigments), OPN1SW NM_001708 TGCATC short-wave-sensitive (color blindness, tritan) H24-157 GTACCTGCGCCAC 156 chemokine (C-C motif) CCR3 NM_001837 TTCTTC receptor 3 H24-159 GTCCTTCTACATC 158 G protein-coupled GPR23 NM_005296 AATGCC receptor 23 H24-160 GAAGAAGCAACT 159 G protein-coupled GPR64 NM_005756 GGGAGCC receptor 64 H24-169 CAACCTGTTCATC 164 galanin receptor 2 GALR2 NM_003857 CTTAAC H24-173 GTTCTCTCAGCAC 168 placental growth factor, PGF NM_002632 GTTCGC vascular endothelial growth factor-related protein H24-180 ATGCAGGTCAGGT 175 solute carrier family 4, SLC4A10 NM_022058 TGTTTC sodium bicarbonate transporter-like, member 10 H24-185 ACCGTGGAAGGC 180 cytochrome P450, CYP24 NM_000782 CTATCGC subfamily XXIV (vitamin D 24-hydroxylase) H24-188 TCGGCAGGGCCA 183 macrophage stimulating 1 MST1 NM_020998 GCATTTC (hepatocyte growth factor- like) H24-190 TCAGAAGGTTGTG 185 KIAA0943 protein Apg4B NM_013325 CAGGAC H24-191 CAACTTGCATGAC 186 amyloid beta (A4) APP NM_000484 TACGGC precursor protein (protease nexin-II, Alzheimer disease) H24-193 ACCAGTGGTAAAT 188 dual specificity DUSP5 NM_004419 GTCAGC phosphatase 5 H24-194 CTCTGTATCCCAT 189 mitogen-activated protein MAP3K9 XM_027237 TCCCTC kinase kinase kinase 9 H24-200 GTAGCACTCTGCG 195 solute carrier family 39 SLC39A4 NM_017767 - ACATGC (zinc transporter), member 4 NM_130849 H24-202 GTTATTCTTCCAC 197 nicotinamide N- NNMT NM_006169 CATGGC methyltransferase H24-205 AGCATGACAGGA 200 UDP-glucose ceramide UGCGL2 NM_020121 AACCTGC glucosyltransferase-like 2 H24-207 CCTTGTTGGCCAA 202 similar to arylacetamide LOC166161 XM_093702 TGATTC deacetylase (esterase) H24-211 CAAGTTCTCCTGC 206 ATPase, H+/K+ ATP4B NM_000705 AAGTTC exchanging, beta polypeptide H24-218 CAACATCCCAACT 213 glutathione reductase GSR NM_000637 GTGGTC H24-219 TATCCTGACCTTC 214 potassium voltage-gated KCNG1 NM_002237 CTGCGC channel, subfamily G, member 1 H24-224 TATTCGTGCGGAG 219 chromosome 9 open SgK071 SK521 GAAGAC reading frame 96 H24-225 ATGGGCTTCAACA 220 arginine vasopressin AVPR1B NM_000707 GCCACC receptor 1B

Example 7 Drug Discovery Against the Identified TARGETs

Compounds are screened for binding to the polypeptides of the present invention. The affinity of the compounds to the polypeptides is determined in a displacement experiment. Such displacement experiments are well known in the art, and can be considered as a common technique among others to identify compounds that bind to polypeptides.

In brief, the polypeptides of the present invention are incubated with a labeled (radio-labeled, fluorescent- or antibody-labeled, or any other detectable label) ligand that is known to bind to the polypeptide and is further incubated with an unlabeled compound.

The displacement of the labeled ligand from the polypeptide is determined by measuring the amount of labeled ligand that is still associated with the polypeptide. The amount of the labeled ligand associated with the peptide is an indication of the affinity for the unlabeled compound.

The amount of labeled ligand associated with the polypeptide is plotted against the concentration of the unlabeled compound to calculate IC50 values. This value reflects the binding affinity of the unlabeled compound to its TARGET, i.e. the polypeptides of the present invention.

Compounds are considered strong binders, when having an IC50 in the nanomolar and even picomolar range. Compounds that have an IC50 of at least 10 micromol or even better in the nmol to pmol range are applied in either the bone alkaline phosphatase assay (BAP) and/or in assays to determine their effect on the induction of osteoblast markers and osteoblast function. Compounds with a lower IC50 are generally considered as of less interest. The polypeptides of the present invention can be prepared in a number of ways depending on whether the assay will be run on cells, cell fractions, or biochemically on purified proteins. Such preparations are well known in the art, as are the different assays.

Example 8 Osteoclast Assays: Validate Anti-Resorptive Activity of Identified TARGETs

Throughout life, the skeleton is in a constant state of remodeling. Focal areas of bone are resorbed by osteoclasts and then replaced by bone matrix newly formed by osteoblasts. The development of osteoporosis is characterized by severe bone loss due to the deregulation of the balance between osteoclast and osteoblast activity, leading to an increased osteoclast-mediated bone resorption.

Osteoclasts emanate from cells of the monocyte/macrophage lineage. In vivo, the differentiation of osteoclast precursor cells towards osteoclasts is controlled by two central factors expressed by stromal cells (MPCs): receptor activator of NF B ligand (RANKL) and osteoprotegerin (OPG). RANKL is a membrane bound ligand expressed on the surface of MPCs which drives osteoclast differentiation. OPG is a soluble decoy receptor for RANKL which inhibits osteoclast differentiation by scavenging active RANKL. The balance between RANKL and OPG expression by MPCs determines the level of osteoclast differentiation.

As MPCs control the differentiation of osteoclasts, it is important to know the effect of the identified TARGET Ad-siRNAs on osteoclast differentiation or activity. Target Ad-siRNAs that decrease osteoclast differentiation/activity, are very valuable, as these are expected to increase bone apposition by two mechanisms: increase of differentiation/activity of osteoblasts and decrease in osteoclast activity. As illustrated by various precedents (Thirunavukkarasu et al., (2000) J Biol Chem 275: 25163-72; Yamada et al., (2003) Blood 101: 2227-34) such a pleiotropic effect of osteogenic factors can be expected.

Osteoclast Differentiation Assay

The effect of osteogenic factors on osteoclastogenesis is evaluated through two types of assays.

In a first assay setup, a coculture of MPCs with primary human mononuclear cells is performed. The effect of the infection of the MPC monolayer with a knock-down virus on its capacity to support osteoclastogenesis is evaluated. The desired effect is the following: knock-down of the Ad-siRNA TARGET gene expression in the MPCs should inhibit osteoclast differentiation driven by a physiological trigger as e.g. a mixture of 10 nM 1,25(OH)₂vitD₃ and 50 nM M-CSF. The monocytes used can be derived from bone marrow or peripheral blood. In the present example, a differentiation experiment based on peripheral blood derived mononuclear cells (PBMCs) is described. MPCs (obtained from Cambrex/Biowhittaker, Verviers, Belgium) are seeded in 96 well plates (1000 cells per well) in -MEM medium (GIBCO-Life Technologies) supplemented with 10% FBS and a day later, these are infected with a TARGET Ad-siRNA. At least three days later, 100 000 PBMCs per well are added as well as M-CSF (R&D systems, 50 ng/ml final concentration). Half the volume of medium is refreshed twice a week by medium +50 ng/ml M-CSF and 10 nM 1,25(OH)₂vitD₃. Readout is performed 14 days after addition of the PBMCs to the coculture. Spontaneous osteoclast differentiation driven by the physiologically relevant mixture of triggers can be assessed by multiple readouts. Microscopic assessment of the number of ‘TRAP positive’, multinucleated cells per well is a generally accepted measure for the level of osteoclast differentiation. ‘TRAP positive’ means that the cells possess a tartrate resistant acidic phosphatase (TRAP) activity. To assess this, the coculture is subjected to an in situ TRAP staining performed according to the Acid Phosphatase detection kit (SIGMA, 386-A). Positive cells acquire a purple color upon treatment. As an alternative readout, a marker specific for mature osteoclasts is measured e.g. TRACP5b (tartrate resistant acidic phosphatase type 5b), calcitonin receptor (CTR) or Cathepsin K (CTSK). Measurement of the amounts of osteoclast-derived tartrate resistant acidic phosphatase protein (TRACP5b) in the coculture supernatant is performed by a commercially available ELISA (BoneTRAP assay, Sba sciences, Turku, Finland). CTR or CTSK are detected by immunocytochemistry, upon application of following general protocol. Medium is removed and the coculture is fixed (4% paraformaldehyde, 0.1% TritonX-100, 4° C., 30 min), washed and blocking buffer (PBS+1% BSA+0.1% Tween20) is added for an incubation of at least 4 hrs. The blocking buffer is removed and the primary antibody directed against CathepsinK (e.g. Oncogene, IM55L) or Calcitonin receptor (e.g. Serotec, AHP635), dissolved at the desired concentration in a suited buffer (e.g. 0.05M Tris.HCl pH 7.4, 1% BSA), is added to the wells. Incubation is performed overnight, 4° C. The mixture is removed, the cells washed (PBS+0.1% Tween20) and the suited, HRP conjugated secondary antibody, diluted in the same buffer as the primary antibody, is added. After an incubation of at least 4 hrs, a washing step is performed (PBS+0.1% Tween20) and luminol (a substrate for HRP yielding a luminescent signal: BM Chemiluminescence ELISA Substrate [POD] (luminol), Roche Diagnostics, Cat No 1582950) is added. After 5 min incubation, readout is performed with a luminometer (Luminoskan Ascent, Labsystem). The 2 assays described (assessment of the amount of multinuclear cells and immunochemistry for the detection of osteoclast-specific markers) allow to assess the differentiation of the mononuclear cells towards osteoclasts, but do not yield information about the bone resorptive activity of the osteoclasts formed.

Activity of the osteoclasts is measured in the pit formation assay. For this purpose, the co-culture and infection of cells is performed as described for assays described above with the difference that a bone-like substrate is present at the bottom of the well in which the co-culture is performed. This bone-like substrate can be a dentin slice (e.g. Kamiya Biomedical Company, Seattle (Cat No KT018)) or equivalent (Calcium carbonate coating, OAAS™, Gentaur; Biocoat™ Osteologic™, BD Biosciences) that is commercially available. The co-culture is performed for at least 14 days on the bone like substrate. Cells are then removed by treatment with sodium hypochlorite and the area resorbed by the osteoclasts (the resorption pit) can be assessed microsopically. This can be facilitated by the treatment of the surface of the dentin slice with toluidine blue.

In a second assay setup, the effect of the infection of the osteoclast precursor cells (PBMCs or BMMCs) with a TARGET virus on its ability to differentiate towards an osteoclast is measured in a monoculture assay. For this purpose, the monocytes (PBMCs or BMMCs) are seeded in a 384 well plate in MEM medium supplemented with 10% serum and 25 ng/ml recombinant M-CSF (R&D systems). One day after seeding, the cells are infected with TARGET Ad-siRNAs. Four days after infection, recombinant RANKL is added to the wells (25 ng/ml, R&D systems). Medium is refreshed twice a week. Fourteen days after addition of RANKL, the differentiation of the monocytes towards osteoclasts is measured using one of the readouts described for the former assay setup. This assay allows the identification of factors that are indispensable for the response of osteoclast precursor cells to M-CSF or RANKL.

PBMC Isolation

PBMCs are obtained from peripheral blood (obtained from patients after informed consent) subjected to the following protocol. Blood is aseptically poured into 50 ml Falcon tubes and spun at 3000 g for 10 min at 25° C. The buffy coat is then collected and diluted 1:1 with PBS. The diluted buffy coat is poured on top of 20 ml Lymphoprep (Sigma) contained in a 50 ml Falcon tube. Upon centrifugation (35 min at 400 g at 25° C.), a white layer of mononuclear cells on top of the Lymphoprep is collected and washed twice with PBS (centrifugation at 200 g, 10 min, 25° C.) and rediluted in 7 ml PBS. This solution is pipetted onto a layer of 7 ml of hyperosmolar Percoll gradient contained in a 15 ml Falcon tube and centrifuged 35 min at 400 g at 25° C. The hyperosmolar Percoll gradient is prepared as follows: 1 volume of 1.5 M NaCl and 9 volumes of Percoll (Pharmacia, d=1,130 g/ml) are mixed. This mixture is added 1:1 to a PBS/Citrate buffer (NaH2PO1.49 mM, Na2HPO4 9.15 mM, NaCl 139.97 mM, Na-citrate (dihydrate) 13 mM, pH 7.2). After centrifugation, monocytes form a discrete ring on top of the gradient. Monocytes are collected and washed in culture medium. Cells are then ready to use in assays.

Example 9 Analysis of ‘Off-Target’ Knock Down Effect

SiRNAs exert knock-down of gene expression through a recently discovered and partially understood mechanism. It is generally accepted that the specific annealing of the siRNA sequence to mRNA is responsible for a gene-specific ‘on-target’ knock-down. However, it cannot be excluded yet that limited mismatching between the siRNA and another mRNA can induce ‘off-target’ down-regulation of gene expression.

In order to exclude that the knock-down of (an) ‘off-target’ mRNA(s) was responsible for the observed osteogenic effect, additional siRNAs/shRNAs are designed for 38 targets that induced mineralization (Example 6) using stringent design criteria. The additional Ad-shRNAs are then tested in the BAP assay.

To address the question of possible ‘off-target’ effects, additional siRNA sequences are designed that align perfectly with the mRNA targeted by the original siRNA. Preferred siRNA sequences do not align to other mRNAs. However, in some cases only siRNAs could be designed that showed some overlap to other mRNAs. For siRNAs that aligned to a minimal number of ‘off-target’ mRNAs (maximum of 2 basepairs non-identity checked for every position of the 19mer) the following rules are applied: the putative ‘off-target’ mRNAs must be different from the putative ‘off-target’ mRNAs identified for the original siRNA; and putative ‘off-target’ mRNAs must be different from the putative ‘off-target’ mRNAs identified for all original target siRNAs. The only exception to these rules made during the course of these experiments are siRNAs designed for PPIA.

For each of the 38 selected target genes, 7 additional siRNAs were designed and processed to derive recombinant adenoviruses. All siRNAs are sequenced upon cloning, to verify their identity and exclude errors due to the oligonucleotide synthesis.

261 Ad-shRNAS were successfully generated and tested in the BAP assay at 3 MOIs in 2 independent experiments, in parallel with the original 38 Ad-shRNAs.

Recombinant adenoviruses encoding the designed shRNAs (Ad-shRNAs) are produced, titered, aliquoted in 96 well plates and stored at −80° C. These plates were processed in the primary BAP assay as follows:

MPC cells wearere seeded with a Multidrop 384 (Labsystems) in black 384 well plates with clear bottom (Costar or Nunc) in 60 μl MSC medium containing 10% fetal calf serum (Progentix, The Netherlands), at a density of 500 cells per well. One day later, a 96 well plate containing aliquoted Ad-shRNAs and another containing negative and positive control viruses (knock-down control plate) are thawed and virus aliquots transferred to the MPC plate using a 96-channel dispenser (Tecan Freedom 200 equipped with a TeMO96 and a RoMa plate handler, Tecan A G, Switzerland). For the control plate, 1 μL virus stock (average titer of 2×10⁹ viral particles per ml) is transferred to the 384 well screening plates. On the control plate (see FIG. 3), negative (N1, N2, N3) and positive (P1, P2) control viruses are diagonally distributed over the plate. N1, N2, N3: Ad-siRNAs targeting the eGFP, mannose-6-phosphate-receptor and luciferase mRNAs, respectively. P1 and P2: Ad-siRNAs targeting the PRKCN(H24-010) and MPP6 (H24-011) mRNAs. P3: Ad-eGFP: overexpression of eGFP allows monitoring of infection efficiency.

The Ad-shRNAs are screened at 3 multiplicities of infection (MOIs): 12,000, 4,000 and 1,333. Ad-shRNAs are aliquotted into the inner wells of a 96 well plate at a titer of 1.5×10⁹/4 μl and ⅓ and 1/9 dilutions are derived of this plate (FIG. 11). The resulting 3 plates are used to infect 3×384 well plates seeded with MSCs, in the A1 and B2 positions of each quadrant using robotics. The viruses from the control plate are pipetted in the A2 and B1 positions.

Next, 5 μl of adenovirus expressing the human coxsackie and adenovirus receptor (hCAR) (AdC15-hCAR/AdC20-hCAR) is transferred into these wells (final MOI of 155) from a 96 well V-bottom plate with the aid of the 96-channel dispenser.

Plates are then incubated at 37° C., 10% CO₂ in a humidified incubator for four days. Four days post infection, the medium containing the adenoviruses is replaced by 60 μl fresh MSC medium containing 10% FCS free of virus. After an additional nine days of incubation, medium is removed, 15 μL of a 4-methylumbelliferylphosphate solution (Sigma, # M3168) is added to each well and the fluorescence of 4-methyl-umbelliferone released by the alkaline phosphatase activity is measured after 15 min incubation at 37° C. using a fluorimeter (excitation: 360 nm; emission: 440 nm; FluoStar, BMG).

All Ad-shRNAs viruses are screened in duplicate at 3 MOIs in two independent screens. Thresholds are calculated for hit calling using either all negative controls present in one screening round (Global' analysis) or using the negative controls present on one screening plate (Local' analysis). Threshold is set at a BAP signal higher than the mean plus 3 times the standard deviation of negative controls. The two individual datapoints for each virus in the batch are analyzed independently. Hits are selected if one Ad-shRNAs scored at least at one MOI in duplicate in at least one of the 2 screens above the threshold (see Table 7).

A ‘Global’ analysis of the data identified 61 siRNAs targeting 32 loci and a ‘Local’ analysis' identified 84 siRNAs targeting 35 loci. The identity of the 38 selected genes is presented in Table 7 together with the final number of siRNAs that scored in the BAP assay.

In this Table, the numbers indicate all siRNAs that scored in the BAP assay, including the original 38 siRNAs. Based on the ‘Global’ and ‘Local’ analysis, an average of 2.61 and 3.21 constructs respectively are identified for each of the 38 validated targets.

All original 38 Ad-shRNAs scored in the BAP assay based on both the ‘Global’ and ‘Local’ analysis.

In conclusion, additional Ad-shRNAs targeting 38 selected targets are designed and constructed. Negative controls present on the control plates are used per plate (Local' analysis) or per batch of plates (Global' analysis) to determine the cutoff for hit calling.

The ‘Global’ analysis results in 61 viruses that scored positive in the BAP assay, confirming 32 of the 38 validated targets. The ‘Local’ analysis results in 84 viruses that scored positive in the BAP assay, confirming 35 of the 38 validated targets. All original 38 Ad-shRNA viruses score in the BAP assay when using either the ‘Global’ or the ‘Local’ analysis. The targets LOC160662, PPIA and SLC39A4 are identified only in the ‘Local’ analysis.

TABLE 7 TARGET Global analysis- Local analysis - Gene Symbol Redundancy Redundancy APG4B 2 3 C13orf6 2 2 C20orf121 3 4 CCR1 3 4 CCR3 2 2 CEL 2 4 CLIC6 2 2 CSNK1G1 2 3 DUSP5 2 2 FLJ22955 3 4 FRK 3 3 GPR124 2 3 GPR23 2 3 GPR64 4 5 Grin2a-GRIN2A 7 6 GZMK 2 2 HRMT1L3 2 2 IRAK2 4 4 LOC160662-LST-3 1 2 LOC167417- 4 5 GPR150 LOC254378 3 4 MAP3K9 4 5 MLNR 4 3 MMP23B-MMP23A 3 2 MNK2 2 3 OR1A2 4 6 PPIA 1 3 RASD1 4 5 RDH11 3 4 SENP3 4 4 SLC16A3 2 3 SLC26A8 1 1 SLC39A4 1 2 SLC4A10 1 1 TAO1 3 4 TAS1R3 2 3 TRPM6 1 1 ULK1 2 3

Example 10 Identification of Small Molecules that Inhibit TARGET Kinase Activity

Compounds are screened for inhibition of the activity of the TARGETS that are kinase polypeptides. The affinity of the compounds to the polypeptides is determined in an experiment detecting changed reaction conditions after phosphorylation. The TARGET kinase polypeptides are incubated with its substrate and ATP in an appropriate buffer. The combination of these components results in the in vitro phosphorylation of the substrate. Sources of compounds include commercially available screening library, peptides in a phage display library or an antibody fragment library, and compounds that have been demonstrated to have binding affinity for a TARGET kinase.

The TARGET kinase polypeptides can be prepared in a number of ways depending on whether the assay will be run using cells, cell fractions or biochemically, on purified proteins. The polypeptides can be applied as complete polypeptides or as polypeptide fragments, which still comprise TARGET kinase catalytic activity.

Identification of small molecules inhibiting the activity of the TARGET kinase polypeptides is performed by measuring changes in levels of phosphorylated substrate or ATP. Since ATP is consumed during the phosphorylation of the substrate, its levels correlate with the kinase activity. Measuring ATP levels via chemiluminescent reactions therefore represents a method to measure kinase activity in vitro (Perkin Elmer). In a second type of assay, changes in the levels of phosphorylated substrate are detected with phosphospecific agents and are correlated to kinase activity. These levels are detected in solution or after immobilization of the substrate on a microtiter plate or other carrier. In solution, the phosphorylated substrate is detected via fluorescence resonance energy transfer (FRET) between the Eu labeled substrate and an APC labeled phosphospecific antibody (Perkin Elmer), via fluorescence polarization (FP) after binding of a phosphospecific antibody to the fluorescently labeled phosphorylated substrate (Panvera), via an Amplified Luminescent Proximity Homogeneous Assay (ALPHA) using the phosphorylated substrate and phosphospecific antibody, both coupled to ALPHA beads (Perkin Elmer) or using the IMAP binding reagent that specifically detects phosphate groups and thus alleviates the use of the phosphospecific antibody (Molecular Devices). Alternatively, the substrate is immobilized directly or by using biotin-streptavidin on a microtiter plate. After immobilization, the level of phosphorylated substrate is detected using a classical ELISA where binding of the phosphospecific antibody is either monitored via an enzyme such as horseradish peroxidase (HRP) or alkaline phospahtase (AP) which are either directly coupled to the phosphospecific antibody or are coupled to a secondary antibody. Enzymatic activity correlates to phosphorylated substrate levels. Alternatively, binding of the Eu-labeled phosphospecific antibody to the immobilized phosphorylated substrate is determined via time resolved fluorescence energy (TRF) (Perkin Elmer). In addition, the substrate can be coated on FLASH plates (Perkin Elmer) and phosphorylation of the substrate is detected using ³³P labeled ATP or ¹²⁵I labeled phosphospecific antibody.

Small molecules are randomly screened or are preselected based upon drug class, (i.e. known kinase inhibitors), or upon virtual ligand screening (VLS) results. VLS uses virtual docking technology to test large numbers of small molecules in silico for their binding to the polypeptide of the invention. Small molecules are added to the kinase reaction and their effect on levels of phosphorylated substrate is measured with one or more of the above-described technologies.

Small molecules that inhibit the kinase activity are identified and are subsequently tested at different concentrations. IC₅₀ values are calculated from these dose response curves. Strong binders have an IC₅₀ in the nanomolar and even picomolar range. Compounds that have an IC₅₀ of at least 10 micromol or better (nmol to pmol) are applied in alkaline phosphatase assay or bone mineralization assay to check for their effect on the induction of osteogenesis.

Example 11 Ligand Screens For TARGET GPCRs.

Reporter Gene Screen

Mammalian cells such as Hek293 or CHO-K1 cells are either stably transfected with a plasmid harboring the luciferase gene under the control of a cAMP dependent promoter (CRE elements) or transduced with an adenovirus harboring a luciferase gene under the control of a cAMP dependent promoter. In addition reporter constructs can be used with the luciferase gene under the control of a Ca²⁺ dependent promoter (NF-AT elements) or a promoter that is controlled by activated NF-κ B. These cells, expressing the reporter construct, are then transduced with an adenovirus harboring the cDNA of a TARGET GPCR. Forty (40) hours after transduction the cells are treated with the following:

a) an agonist for the receptor and screened against a large collection of reference compounds comprising peptides (LOPAP, Sigma Aldrich), lipids (Biomol, TimTech), carbohydrates (Specs), natural compounds (Specs, TimTech), small chemical compounds (Tocris), commercially available screening libraries, and compounds that have been demonstrated to have binding affinity for a polypeptide comprising an amino acid sequence selected from the group consisting of the SEQ ID NOs of the TARGET GPCRs; or

b) a large collection of reference compounds comprising peptides (LOPAP, Sigma Aldrich), lipids (Biomol, TimTech), carbohydrates (Specs), natural compounds (Specs, TimTech), small chemical compounds (Tocris), commercially available screening libraries, and compounds that have been demonstrated to have binding affinity for a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NOs of the TARGET GPCRs.

Compounds, which decrease the agonist induced increase in luciferase activity or the constitutive activity, are considered to be antagonists or inverse agonists for a TARGET GPCR. These compounds are screened again for verification and screened against their effect on osteoblast differentiation. The compounds are also screened to verify binding to the GPCR. The binding, osteogenesis and reporter activity assays can be performed in essentially any order to screen compounds.

In addition, cells expressing the NF-AT reporter gene can be transduced with an adenovirus harboring the cDNA encoding the α-subunit of G₁₅ or chimerical Gα subunits. G₁₅ is a promiscuous G protein of the G_(q) class that couples to many different GPCRs and as such re-directs their signaling towards the release of intracellular Ca²⁺ stores. The chimerical G alpha subunits are members of the G_(s) and G_(i/o) family by which the last 5 C-terminal residues are replaced by those of G_(αq), these chimerical G-proteins also redirect cAMP signaling to Ca²⁺ signaling.

FLIPR Screen.

Mammalian cells such as Hek293 or CHO-K1 cells are stably transfected with an expression plasmid construct harboring the cDNA of a TARGET GPCR. Cells are seeded, grown, and selected until sufficient stable cells can be obtained. Cells are loaded with a Ca²⁺ dependent fluorophore such as Fura3 or Fura4. After washing away the excess of fluorophore the cells are screened against a large collection of reference compounds comprising peptides (LOPAP, Sigma Aldrich), lipids (Biomol, TimTech), carbohydrates (Specs), natural compounds (Specs, TimTech), small chemical compounds (Tocris), commercially available screening libraries, and compounds that have been demonstrated to have binding affinity for a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NOs of the TARGET GPCRs, by simultaneously adding an agonist (alternatively no agonist need be added if the constitutive activity of the receptor is used) and a compound to the cells. Activation of the receptor is measured as an almost instantaneously increase in fluorescence due to the interaction of the fluorophore and the Ca²⁺ that is released. Compounds that reduce or inhibit the agonist induced increase in fluorescence (or constitutive fluorescence) are considered to be antagonists or inverse agonists for the receptor they are screened against. These compounds are screened again to measure the amount of osteoblast differentiation as well as binding to a TARGET GPCR.

Aequoscreen.

CHO cells, stably expressing Apoaequorin are stably transfected with a plasmid construct harboring the cDNA of a TARGET GPCR. Cells are seeded, grown, and selected until sufficient stable cells can be obtained. The cells are loaded with coelenterazine, a cofactor for apoaequorin. Upon receptor activation intracellular Ca²⁺ stores are emptied and the aequorin will react with the coelenterazine in a light emitting process. The emitted light is a measure for receptor activation. The CHO, stable expressing both the apoaequorin and the receptor are screened against a large collection of reference compounds comprising peptides (LOPAP, Sigma Aldrich), lipids (Biomol, TimTech), carbohydrates (Specs), natural compounds (Specs, TimTech), small chemical compounds (Tocris), commercially available screening libraries, and compounds that have been demonstrated to have binding affinity for a polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NOs of the TARGET GPCRs, by simultaneously adding an agonist (alternatively no agonist need be added if the constitutive activity of the receptor is used) and a compound to the cells. Activation of the receptor is measured as an almost instantaneously light flash due to the interaction of the apoaequorin, coelenterazine, and the Ca²⁺ that is released. Compounds that reduce or inhibit the agonist induced increase in light or the constitutive activity are considered to be antagonists or inverse agonists for the receptor they are screened against. These compounds are screened again to measure the amount of osteoblast differentiation as well as binding to a TARGET GPCR.

In addition, CHO cells stable expressing the apoaequorin gene are stably transfected with a plasmid construct harboring the cDNA encoding the α-subunit of G₁₅ or chimerical G_(α) subunits. G₁₅ is a promiscuous G protein of the G_(q) class that couples to many different GPCRs and as such redirects their signaling towards the release of intracellular Ca²⁺ stores. The chimerical G alpha subunits are members of the G_(s) and G_(i/o) family by which the last 5 C-terminal residues are replaced by those of G_(αq), these chimerical G-proteins also redirect cAMP signaling to Ca²⁺ signaling.

Screening for Compounds that Bind to the GPCR Polypeptides (Displacement Experiment)

Compounds are screened for binding to the TARGET GPCR polypeptides. The affinity of the compounds to the polypeptides is determined in a displacement experiment. In brief, the GPCR polypeptides are incubated with a labeled (radiolabeled, fluorescent labeled) ligand that is known to bind to the polypeptide and with an unlabeled compound. The displacement of the labeled ligand from the polypeptide is determined by measuring the amount of labeled ligand that is still associated with the polypeptide. The amount associated with the polypeptide is plotted against the concentration of the compound to calculate IC₅₀ values. This value reflects the binding affinity of the compound to its TARGET, i.e. the TARGET GPCR polypeptides. Strong binders have an IC₅₀ in the nanomolar and even picomolar range. Compounds that have an IC₅₀ of at least 10 micromol or better (nmol to pmol) are applied an osteoblast differentiation assay to check for their effect on osteogenesis. The TARGET GPCR polypeptides can be prepared in a number of ways depending on whether the assay are run on cells, cell fractions or biochemically, on purified proteins.

Screening for Compounds that Bind to a TARGET GPCR (Generic GPCR Screening Assay)

When a G protein receptor becomes constitutively active, it binds to a G protein (G_(q), G_(s), G_(i), G_(o)) and stimulates the binding of GTP to the G protein. The G protein then acts as a GTPase and slowly hydrolyses the GTP to GDP, whereby the receptor, under normal conditions, becomes deactivated. However, constitutively activated receptors continue to exchange GDP to GTP. A non-hydrolyzable analog of GTP, [³⁵S]GTPγS, can be used to monitor enhanced binding to membranes which express constitutively activated receptors. It is reported that [³⁵S]GTPγS can be used to monitor G protein coupling to membranes in the absence and presence of ligand. Moreover, a preferred approach is the use of a GPCR-G protein fusion protein. The strategy to generate a TARGET GPCR-G protein fusion protein is well known for those known in the art. Membranes expressing TARGET GPCR-G protein fusion protein are prepared for use in the direct identification of candidate compounds such as inverse agonist. Homogenized membranes with TARGET GPCR-G protein fusion protein are transferred in a 96-well plate. A pin-tool is used to transfer a candidate compound in each well plus [³⁵S]GTPγS, followed by incubation on a shaker for 60 minutes at room temperature. The assay is stopped by spinning of the plates at 4000 RPM for 15 minutes at 22° C. The plates are then aspirated and radioactivity is then read.

Receptor Ligand Binding Study on Cell Surface

The receptor is expressed in mammalian cells (Hek293, CHO, COS7) by adenoviral transducing the cells (see U.S. Pat. No. 6,340,595). The cells are incubated with both labeled ligand (iodinated, tritiated, or fluorescent) and the unlabeled compound at various concentrations, ranging from 10 pM to 10 μM (3 hours at 4° C.: 25 mM HEPES, 140 mM NaCl, 1 mM CaCl₂, 5 mM MgCl₂ and 0.2% BSA, adjusted to pH 7.4). Reactions mixtures are aspirated onto PEI-treated GF/B glass filters using a cell harvester (Packard). The filters are washed twice with ice cold wash buffer (25 mM HEPES, 500 mM NaCl, 1 mM CaCl₂, 5 mM MgCl₂, adjusted to pH 7.4). Scintillant (MicroScint-10; 35 μl) is added to dried filters and the filters counted in a (Packard Topcount) scintillation counter. Data are analyzed and plotted using Prism software (GraphPad Software, San Diego, Calif.). Competition curves are analyzed and IC₅₀ values calculated. If one or more data points do not fall within the sigmoidal range of the competition curve or close to the sigmoidal range the assay is repeated and concentrations of labeled ligand and unlabeled compound adapted to have more data points close to or in the sigmoidal range of the curve.

Receptor Ligand Binding Studies on Membrane Preparations

Membranes preparations are isolated from mammalian cells (Hek293, CHO, COS7) cells over expressing the receptor is done as follows: Medium is aspirated from the transduced cells and cells are harvested in 1×PBS by gentle scraping. Cells are pelleted (2500 rpm 5 min) and resuspended in 50 mM Tris pH 7.4 (10×10⁶ cells/ml). The cell pellet is homogenized by sonicating 3×5 sec (UP50H; sonotrode MS1; max amplitude: 140 μm; max Sonic Power Density: 125W/cm²). Membrane fractions are prepared by centrifuging 20 min at maximal speed (13,000 rpm ˜15,000 to 20,000 g or rcf). The resulting pellet is resuspended in 500 μl 50 mM Tris pH 7.4 and sonicated again for 3×5 sec. The membrane fraction is isolated by centrifugation and finally resuspended in PBS. Binding competition and derivation of IC₅₀ values are determined as described above.

Internalization Screen (1)

Activation of a GPCR-associated signal transduction pathway commonly leads to translocation of specific signal transduction molecules from the cytoplasm to the plasma membrane or from the cytoplasm to the nucleus. Norak has developed their transfluor assay based on agonist-induced translocation of receptor-β-arrestin-GFP complex from the cytosol to the plasma membrane and subsequent internalization of this complex, which occurs during receptor desensitization. A similar assay uses GFP tagged receptor instead of β-arrestin. Hek293 cells are transduced with a TARGET GPCR vector that translates for a TARGET GPCR-eGFP fusion protein. 48 hours after transduction, the cells are set to fresh serum-free medium for 60 minutes and treated with a ligand for 15, 30, 60 or 120 minutes at 37° C. and 5% CO₂. After indicated exposure times, cells are washed with PBS and fixed with 5% paraformaldehyde for 20 minutes at RT. GFP fluorescence is visualized with a Zeiss microscope with a digital camera. This method aims for the identification of compounds that inhibit a ligand-mediated (constitutive activity-mediated) translocation of the fusion protein to intracellular compartments.

Internalization Screen (2)

Various variations on translocation assays exists using β-arrestin and β-galactosidase enzyme complementation and BRET based assays with receptor as energy donor and β-arrestin as energy acceptor. Also the use of specific receptor antibodies labeled with pH sensitive dyes are used to detect agonist induced receptor translocation to acidic lysosomes. All of the translocation assays are used for screening for both agonistic and antagonistic acting ligands.

Melanophore Assay (Arena Pharmaceutical)

The melanophore assay is based on the ability of GPCRs to alter the distribution of melanin containing melanosomes in Xenopus melanophores. The distribution of the melanosomes depends on the exogenous receptor that is either G_(i/o) or G_(s/q) coupled. The distribution of the melanosomes (dispersed or aggregated) is easily detected by measuring light absorption. This type of assay is used for both agonist as well as antagonist compound screens.

REFERENCES

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SEQUENCE LISTING

The Sequence Listing has been submitted electronically along with this application as file 27893B U.S. SEQ LIST.ST25, 2.8 MB on and is hereby incorporated-by-reference. 

1. A method for identifying a compound that induces differentiation of undifferentiated mammalian cells into osteoblasts, comprising (a) contacting a compound with an undifferentiated mammalian cell in culture, in which cell has been introduced an expressible nucleic acid coding for and expressing a GPCR polypeptide comprising an amino acid sequence of SEQ ID NO: 379; (b) measuring a level of a biochemical marker in the GPCR polypeptide biological pathway in said mammalian cell, in which biological pathway bone alkaline phosphatase is expressed, and which biochemical marker is expressed by said undifferentiated mammalian cell, and which level of biochemical marker is indicative of the differentiation of said undifferentiated mammalian cells into said osteoblasts: (c) determining if said levels of said biochemical marker expressed by said undifferentiated mammalian cell contacted with said compound measured in step (b) are decreased as compared to levels of said biochemical marker expressed in said undifferentiated mammalian cell that is not contacted with said compound; (d) selecting a compound, determined to have decreased said levels of biochemical marker expressed by said undifferentiated mammalian cell contacted with said compound, for confirmation as an inducer of mammalian cell differentiation into osteoblasts; (e) contacting said compound selected in step (d) with said GPCR polypeptide in an in vitro cell-free preparation; and (f) measuring the binding affinity of said compound to said GPCR polypeptide.
 2. The method according to claim 1, wherein said undifferentiated mammalian cell is an osteoblast progenitor cell.
 3. The method of claim 1 wherein said marker is bone alkaline phosphatase.
 4. The method according to claim 1 wherein said measuring comprises determining the expression of a reporter gene in said mammalian cell, wherein said reporter gene is controlled by a promoter responsive to a second messenger, the levels of which are a measure of the expression and/or activity of said GPCR polypeptide.
 5. The method according to claim 4, wherein said second messenger is cyclic AMP, Ca²⁺or both, and said promoter is a cyclic AMP-responsive promoter, an NF-KB responsive promoter, or a NF-AT responsive promoter.
 6. The method according to claim 5, wherein said reporter gene is selected from the group consisting of alkaline phosphates, GFP, eGFP, dGFP, luciferase and beta-galactosidase.
 7. The method according to claim 1, wherein said compound measured in step (f) exhibits binding affinity of at least 10 micromolar to said GPCR polypeptide.
 8. The method according to claim 4, wherein said undifferentiated mammalian cell is an osteoblast progenitor cell. 